We enjoyed our stay at Elena's. It is a newer contemporary building on Zamora with security at the front door who let you in and out and let you into the pool/gym area. If you don't speak Spanish, learn to use your Google translator to learn a couple of phrases like "We are guest here in room XXX" and "We are guests here, can you please let us into the pool area? Thank you." I tipped the guards a couple of bucks when they would come to let us in the pool, they have to come and meet you and put their finger on the fingerprint reader to let you in. There is a nice steam room but you have to get it going about 30 min. before you go in to get it hot. We really enjoyed having the pool there to swim laps and relax. The pool is very long and you can do real lap swimming, the water is warm and clean and not over-chlorinated. The gym is nice too.
It is in a great location in regards to restaurants, the Superama market, little cafes and lovely parks like Parque Mexico and Parque Espana. Have breakfast at Maque! It is very close to Chapultepec Park where we spent a lot of time. We loved walking down the avenues (boulevards) with the walkways in the middle with gardens. Very charming. We rented bicycles and rode all over. It is actually a bike-friendly city with bike lanes on the larger streets and pretty chill on the small streets, just follow the rules, stay alert and ride with the direction of the traffic. If you have your phone, you can use the dockless bikes that have apps or you can use the EcoBici bikes but you have to sign up online. A little tricky but we managed to do it. We were only using one phone so we couldn't rent two app bikes at once.
We really like the Condesa, Roma and Hippodromo neighborhoods.
Elena was very responsive on the AirBnB site and we had no problems getting in. Everything was very clean and comfy. The shower and everything worked great. There is a washer/dryer in the apt.
There is a bar on top of the building next door which was kind of odd but it wasn't a problem. They crank up around 9 on Wed-Sat and go til about 2-3 but they played cool music and it never got too crazy. I actually wanted to go check it out because it sounded like a fun happy place but couldn't get my wife to go. We go to bed pretty early but my wife slept right through it and I put earplugs in and it didn't bother me. This is Mexico City so it can be a little noisy. If you're​ really sensitive then I would consider this factor.
We had a great time and would stay there again. Thanks Elena!