The building is a super-old convent and is impressive. The apartment is spacious and adequate in every way (though we didn't cook) -- it's not "luxury" appointments but has everything you'd need to enjoy the city. We didn't have any noise issues (pigeons in the morning).
The apartment is an easy 10-minute walk to almost everything in the historic district. An airport bus stops right at the door. We didn't have any personal safety concerns, but the immediate neighbourhood gets dead at night (Roma and La Condesa, which have all the "buzz" you could possibly want, are a $10 Uber away).
We had good communication with Jano, and Karolina (who is the local contact) was gracious, helpful, and we always felt that she was "on hand" if we needed her. The AirBNB "system", which we used for the first time, worked well - we got what we expected and dealing with our hosts was pleasant.