Very great stay at Bernardo's. We stayed 2 weeks and that was a marvelous experience.
The location is central in Coyoacán and this is not that complicated to reach the metro (20min walking or taking the bus line 7 for 2pesos).
The place is so quite, trust me this is a rare thing in Mexico!
Bernardo and his wife were very gentle and helped us when needed. Just go speak with them or call them, they are always available to help.
We strongly recommend this place :)