UPDATE

Thanks for all the answers and comments, I see now that I will have to talk about this with him openly if I want my issues solved properly.
As an addition, I will try to start a conversation about our current living situation and ask him if he is happy with everything so far. I have not considered the possibility that maybe he also has issues that he does not speak up about since he is basically only a guest.

I made sure to be clear on what I wanted when he moved in. I told him he could live with me for as long as he liked, but I would prefer it if he would eventually get his own place since our relationship is still very new (I just don't think you should move together after just 3 months). He agreed but also said he would be fine with staying at my place permanently. I didn't say anything to that in response, because I didn't know what to say.
On one hand I know moving together after just 3 months is too soon. But on the other hand we love each other and I feel like we'll be together for a long time anyways. Being with him feels like being with someone I have known for years.

From time to time I feel like I want an evening to myself. Since he moved in, I have no alone time anymore. It was a price I had no problems with paying at first (I knew I wouldnt be alone anymore if he moved in), but I am starting to miss a little bit of time to myself sometimes. He doesnt have any friends he could meet up for an evening or any hobbies he could persuade outside, which is why I knew beforehand that things were going to be this way. But since he moved in, I have literally had not a single moment where I was alone in my apartment.

Some of the things he does are unintentionally inconsiderate.
I get up for work at 7, but today he woke up a few minutes before me and took a shower, thus occupying the bathroom. I couldn't get ready in time and arrived 15 minutes late for work. He could have easily just gotten in the shower after I left, since he doesnt work on monday and has no courses either.

There are a few more other small things that annoy me, like the dirty dishes he just leaves on the table, his new sound system (I can hear every game, video, music, .. playing on his pc across 2 rooms) or the constant mass of laundry he produces.

I want to keep a healthy relationship with him and eradicate the negative feelings I get when the problems from above arise.

I am looking for an approach that won't hurt his feelings or force him to move out, but just to make him aware that there is a problem that needs solving. How do I correctly adress this issue and what kind of solutions can I even propose to him?

I made sure to be clear on what I wanted when he moved in. I told him he could live with me for as long as he liked, but I would prefer it if he would eventually get his own place since our relationship is still very new (I just don't think you should move together after just 3 months). He agreed but also said he would be fine with staying at my place permanently. (To which i did not respond, since I already told him what i preferred)

We have not set any boundaries or rules on living together, since I thought this was only a temporary situation. And maybe it still is, but I do not know if he decided to just stay and ignore my preference or simply thinks that I got used to him living with me. There are now slowly things arising like:

• him taking a shower when I need to get ready for work, while he has a day off (I came late to work because of that)
• loud music when I need some peace and quiet
• no more time alone in my apartment
• a lot of laundry, dirty dishes, ..

And I do not know how to approach him about these things, since A) I do not want to suggest that he has to move out and B) he thinks he can stay because I am talking about long-term commitments.
I am not sure if A and B are in conflict to each other, but what I basically want is I don't want to "force" him to move out, nor do I want to invite him permanently into my place.

I want to keep a healthy relationship with him and eradicate the negative feelings I get when the problems from above arise.

I want to find a non-suggestive way of reminding him that I would still sort of prefer if he got his own place, without sounding like I want him to move out. And if he decided to stay, that there are things that need to change.

I am looking for an approach that won't hurt his feelings or suggest him to move out, but just to make him aware that there is a problem that needs solving. How do I correctly start up a conversation about this? What can I say or do so he knows he is free to stay with me forever if that is his wish (though it is not mine), but then we have to set up some rules?

And just for clearance: I would prefer it if he moved out. That means if he wants to stay with me I would accept that. But if he has no preference of staying/ moving then I would like for him to move out.