Great colors/shades and perfect floor, but maybe I would change the columns and walls. 
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I sort of plan to. Though I like the overall color of the walls and theme some of the areas that it touches don't line up right with the transition from light green to dark green. The column... yeah definite. Looks more like plaster than I care for.
If it's meant to be unclean you should add more dirt decals to the walls and the floor. The tileset already looks good, if the furniture in the first screenshot is not part of the tile.
Even if those are just placeables you should consider retexturing them. Not only does the wood texture not match the style of your tileset, it is also a bad texture in general.
The furniture is part of the tileset, and yeah I do plan absolutely to retexture those. They are just in the default state now until I get the overall 'Theme' down. More than half of the retexturing isn't done at all. You can see the stone along the walls on the floor? Yeah, those are default too. Same with the rubble in the back, and the dirt behind the walls. I'm considering going for a rusted metal texture for the furniture on top... though I may just go with something else. Unsure yet.
I'm a little concerned about going overboard with the dirt decals on the texture for the floor and walls itself. I want it to be unclean, but not completely ruinous. Plus the first time I used more dirt on the texture it ended up creating such obvious floor patterning (not that the green/gray tiles aren't patterned enough) that it became distracting. That effect where you get that same shaped glob of dirt every five feet... yeah. I prefer personally to use placeables to kind of break it up more. Which, provided this goes somewhere, will be something I'll do.
