Pros:
Condesa was a very responsive host. She gave us clear instructions for check-in and local restaurant recommendations. The apartment is in a great, central location where coffee shops, museums, parks, and places to eat are plentiful.
Cons:
Like other guests mentioned, the apartment definitely needs some maintenance and deeper cleaning. When we arrived (after the check-in time), the cleaning lady was still there. As for the check-out, the cleaning lady showed up early even though we requested a late check-out.
Like other guests also mentioned, we had very loud upstairs guests for two of the eight nights we were there. To be fair, that is more an issue of the building's construction (ie. single pained windows and thin walls).
In conclusion, I would book this place if you are on a strict budget and don't mind potentially loud neighbors.