We had a lovely one month stay at Norman and Yamilis' place and highly recommend it. We found the photos and other reviews to be accurate. We did not have any issues using the keys.
San Telmo is an ideal location if you want to be close to everything. There are plenty of restaurants, bars and shopping in the area. The apartment is right on the Plaza Doreggo which is also convenient for taxis. You are a nice walk or short taxi ride to many attractions. We felt very safe in the neighborhood and that the building is quite secure.
Norman kindly helped answer our questions prior to our trip and checked in with us while we were there. We appreciated his responsive nature. Jose, the on-site manager, was also very friendly and helpful with our questions and provided suggestions.