I stayed at Monique's apartment for 4 nights after climbing Aconcagua. There were three things I loved about the apartment...the bed was super comfortable (which I appreciated after being in a sleeping bag for so long), the location was PERFECT with short walks to bars, restaurants, tourist sites, and Plaza Dorrego...and last, I really enjoyed the evening I spent with Monique's daughter and her boyfriend.
The apartment is small with no views from the window, but it has all that you'd need and it feels very homey! As others mentioned, you can hear the neighbors, so light sleepers may want earplugs...or an extra glass or two of wine before bed! I'm a light sleeper, but had no problems getting/staying asleep, and I was able to sleep in until 9:00-10:00am each day without being woken up by neighbor noises.
All in all, this was an awesome experience. The location is perfect and the price is more than fair for what/where the apartment is.
And thanks for the bottle of wine as a welcome gift!