Alright, first off, your windows and doorways need fitting frames. Those bright looking window frames, for example, blend in too well with the wall textures. At least in my opinion, those should be changed, perhaps to a darker texture, so the window frame can be distinguished from the walls (At least from the inside).
Your ceilings are always pitch black, which doesn’t look nice. To fix that, just add a light entity under (what I assume you are using) your spotlight entities, but have it less bright, that way your ceilings will be lit, however not too bright or too dark.
Another thing is that your rooms and hallways are very bland, I suggest you check out the “How to make your maps look GOOD [HD]” thread, it shows a lot of quite nice examples of how to make a hallway less boring.
Now, in your apartments, the cupboards you have should have wooden textures, rather than the same texture as a wall would have. That way it will be easier to distinguish a cupboard from a wall.
Next thing I notice, your buildings are very blocky. Now I know many buildings look like blocks in real life, that isn’t very appealing in a video game and I would suggest you change your buildings around, give them some more shape, make them look partially irregular, yet functional.
Now, one last thing I have to mention is that your buildings are mostly empty and while I am aware that your map is still a work in progress, I would like to suggest you fill them up. Make them usable for servers, seeing as this is supposed to become a roleplaying map, it should be usable as such.
Too often have I joined servers which disallowed prop spawning, yet most if not all apartments and shops were completely empty and therefore not very usable. I’d simply like to see this not become another bland “roleplay” map, no offense, but I have just seen too many of those.
Now then, that is quite a bit of a text wall… well, you asked for constructive criticism, I tried my best to do so. And I am aware that this is a work in progress, however, you show us what the map currently looks like and I give my thoughts on it.