Mariana's place is perfectly located to explore Condesa, Roma (North and South), and the area along Reforma (the Angel and Chapultepec). The metro bus stop running up and down Insurgentes is 1/2 block away, though walking anywhere is an easy option (a walk to the Angel Monument is 30 minutes; anywhere in Condesa is 5-15).
Medellin Market (fresh fruits and veggies and several good small restaurants) is a 5 minute walk. There is a small convenience store across the street, and a "wash and fold" laundry drop off 1/2 block away ($30 MXN per kilo) across the street - if you bring it in early enough in the morning they'll get it back to you that evening.
Mariana's space is as depicted in the photos. It's not large, but it is functional. Even though it's only 1/2 block from Insurgentes we were amazing how quiet it was. The space is private, but at the front of a larger house. It is older construction, so not a lot of electrical plugs (sufficient though, you just aren't going to have everything plugged in on your bedside table). The shower is powerful and the water is wonderfully hot.
We would stay at Mariana's again.