I was the first guest to stay at Roberto's place, and loved his place! It is basic, stylish and simple with alll basic amenities there. The bed is comfortable, and there is enough storage space. I used Roberto's bike on a daily basis, was quite a plus!
The building in general is pretty quiet, considering you are in central Mexico City, and came through the earth quake without problems (yes, i was there during).
All in all a great place to stay with a very pleasant host who takes his job seriously. Recommended!