You are probably not updating this map actively anymore, but here's a few of the problems you might want to fix:

1a- IN MY OPINION, the map is too boxy for CS:GO itself, and more of a source-esque map.

1- Straight from CTSpawn, I can already see some lighting issues: http://i.imgur.com/YIyWiKX.jpg

2- Cubemaps are missing as shown below, make sure to place some env_cubemap entities around reflective objects.
http://i.imgur.com/dQvKJj7.jpg
http://i.imgur.com/VJSxmh0.jpg

3- Lightmaps are not baked correctly in some parts of the map:
http://i.imgur.com/HavtKo3.jpg
http://i.imgur.com/djzYXCP.jpg
(To fix the glitch above, render your lighting in Full compile + HDR before uploading to the Workshop.)

4- You missed a brush over here:
http://i.imgur.com/UJN16Ak.jpg

5- Try using func_breakable_surf instead of this glass, might cause more dynamic fight environments:
http://i.imgur.com/xEnVyig.jpg

6- These slopes look unnatural and break the map's look a lot.
http://i.imgur.com/QLBjbeR.jpg
http://i.imgur.com/84AeOww.jpg

If you want help with any of this please let me know, i will gladly help you on the problems listed above.