Well, what can I say about this demo?
The story seems well written, CG is good and Ren'Py is working nicely, the dev hasn't ruined its menus nor tried to disable its functionality.
Storywise: this isn't even a full prologue of the story, only a tiny part of it. You can only meet a nerdy guy who moves out (and therefore probably won't play any significant role in the game) and a bunch of memories about awful experiences with female tenants in the past. You don't even get to meet the new tenant or tenants, you will get no idea what kind of a story it will turn out to be. There are no roomies there at this point that the name of the game is talking about, so the demo isn't demonstrating much of anything. No girls in the banner to see anywhere, so it might classify as false advertising
So I would rather call it a tech or (dev) skill demo, rather than a full demo of the game, since the engine tech is a standard Ren'Py and this demo only demonstrates CG and some writing skill of the dev.
We'll have to wait for a full demo or a first part of the game to get any idea about the actual game, I guess. Right now there's really nothing to see in there.