We had a wonderful time at Leonora. The place was very spacious with 2 nice rooms, a living room and even a den, exactly like advertised. The apartment was very clean and staff came every day to make the beds and tidy up - like in a hotel. The only negative thing I can think about is that the apartment is pretty dark. It has only 3 windows facing a courtyard with little natural light coming in. It didn't bother us at all as we spent most of the days discovering Mexico City. The access to the building is very secured with the main door only opening with a key card and there is always someone at reception. Even though the place is in a small building with other apartments, it felt very much like staying at an hotel with a receptionist, which was very nice. It is also convenient because they were able to store our luggage after we checked out.
The neighborhood of La Condesa is wonderful. Very peaceful, green and safe. There are a ton of coffee and food options near by.