Hi, first I really like the modern, decent vector styling 🙂

But I noticed that currently it's not easy to understand how you can move along the building, esp. between levels. Most rooms look the same, only private rooms have a different color.

I like to suggest that rooms like entrance, waiting, reception, lobby, stairs, elevator get also a different style to show that they are different from other rooms and to support navigation of viewers by this POIs esp. between different levels.
How about a different colour or a icon similar to steps?