I had a wonderful stay at Elena's apartment in Condesa. Elena is an amazing host -- she was extremely kind, attentive, and always responded to me very quickly if there was an issue. The apartment itself is very cozy, with a ton of natural lighting that pours in from the large window. It is very well-equipped for long stays (I spent 2 months here), having a full kitchen and all the appliances that you need for cooking. The building is located in an extremely safe and quiet neighborhood, and the entrances are guarded by security 24 hours a day. I always felt very safe and comfortable here. One of the best perks in my opinion was the gym in the building, which is basically brand new. If you are into exercising and fitness, this is a wonderful option to have. Overall, I highly recommend this residence for your stay in Mexico City.