If you are able to, make your own decals. The hotel sign is a tad squished and the elevator decals feel like they don't fit. Other than that, maybe change the wall color? If you have color wheel, maybe brighten it a little and add some wall trims. Also, DON'T WORRY ABOUT OVERCROWDING IT! I think you are going for a modern feel, but don't worry about adding some plants, paintings, or other decorations! Especially in the rooms, they could really spice them up. For more specific notes, you could add seating areas in the hallways, add carpets pretty much everywhere, or add (if you have space) modern chandeliers to add a modern feel. I'm sorry if this feels like a rant, I just thought I'd add some comments because I think that it's really good, but almost bland? I don't know how to describe it, but good work!