This is the second time in a year we have stayed at Agustin's place and we have sent friends to stay there, too. That says it all, doesn't it? We have, and would, come back and recommend it highly to other visitors.
The appeal for us is part location (ideal for what we like and with those incredible pastries right downstairs), part comfort level (plenty of space, home-like furnishing, great bed/mattress, nice linens, incredible natural light) and part the ease of use (full-time concierge on site) and swift communications from the hosts.
A solid choice, and that's before you start eating the pastries available from Lardo downstairs, going to the Tuesday market, walking to the Metro or Chapultapec in under 10 minutes, etc.