Well let me tell you what I think about it. This is so freaking awesome. It looks incredible, more than incredible. This is some awesome art, you have to keep it on making this kind of art, it is really awesome. You deserve these 5 stars
I like many things about it. The room design and decor are well-thought out. The overly-minimalist style, particularly the bright-white everywhere, does make it easy to make a boring scene, though. The wall hanging does spice it up a bit, but it also seems out of place. I think a glass sculpture would go better, for example.
My biggest issue is the lighting. Your shadows just aren't ... well, there. I can see under the table that you've enabled shadows in the render, but in general it looks shadowless. I'm guessing you used a hemi light. Reduce the size of the hemi and maybe turn down how bright the light is. With all the bright-white in the scene, it's a bit overwhelming to have light apparently coming from everywhere. Also, there's a way to change the reflect surfaces (the steel of the chairs) such that it continues to be reflective, but less mirror-like. I don't know how to do that in your program, though.
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