Positives: The neighborhood cannot be beat. You are in a great location in Narvarte, close to lots of restaurants and excellent street food and a huge supermarket. If you want to stay in a more down-to-earth neighborhood (ie, not Condesa) then I can't recommend Narvarte enough.
Check in was very easy. Communication was excellent.
Negatives: This place, although neat and nice, feels a lot more like a hostel than someone's shared apartment. This bedroom is on a shared floor with two other rooms, and although there was only other occupied room when I was there, and he was quiet, this has potential to feel like a hostel. The fridge is very small and although the kitchen is great for cooking, there really isn't a lot of space for your groceries.
The internet was practically non-existent and this was a problem for me. Maybe not for you.
Be advised that the only way into the apartment is a VERY narrow spiral staircase. If you have mobility issues (or are claustrophobic) maybe this isnt the place for you.