A beautiful map with great level of detail and well placed weapons. fantastic as a free for all cant belive noone had added this map here b4 Oo
Improvements: I would like more spawn points, possibly, it may be a condition of the map size but when a server is full spawns tend to be right in front of you :)

Its a nice compact map. there was only one problem i found while inside of it.

the crate far above that water area, laying on the wooden platform, i pulled it off with the gravity gun but it gets stuck on a clip i presume, should look into that being able to fall down and not float in midair

Design: This map is designed in a powerhouse style, for a good gameplay but I was dissappointed when I tested it I dislike the only thing - it's very small. Good for PvP, but not useful on TDM servers etc.
I love this atmosphere - trash, dirt and dust, old brick walls etc, but WHY DID YOU CALLED THIS 'DM_POSTOFFICE?' =)
Gameplay: Good gameplay I think, but there is a low number of physprops, and I love the physcannon...
Looks: Looks very nice at all, good work, but the water texture at the bottom of the map could be better. This one ius too clear. I'd recommend you water_canals_water2, dark green. The volumetric light models look very well and you p[laced it just there where they MUST be. But... Their low-polygonic ends are very well-seen if player stands inside these models. If there would be a sun sprite, it would look much better.
I give you 9.5 points for looks because you filled this map with a very nice atmosphere of forgotten place. I tried to create such an atmosphere but I never succeed...
P.S. Hope you will add some more screenies, there are many nice moments there to look at.