We had a fantastic stay at Sylvia's apartment. It's centrally located in Condesa, only a 5-10 minute walk to Condesa's best restaurants and cafés. Roma is a 15 minute walk.
As other guests have noted, there isn't heat, although there is a space heater in the bedroom. The apartment was very cold during our stay in late December - early January. Bring warm clothing if you plan to stay during this time.
The apartment is very nice. The doormen are wonderful. During our stay, there was a schnauzer left outside of a first-floor unit that barked frequently, but it didn't bother us as we have a dog at home.
I would absolutely stay here again.