I loved staying at Mario's place. The apartment was exactly as described, and very conveniently located close to the Dorrego Subte station and many buses come nearby. Mario's guidebook contains a very thorough list of restaurants, places to see and things to do while staying at his house. I got to meet Mario and his wife while I was there and they were wonderful hosts. The apartment is clean, well maintained, the guest bedrooms are spacious and the bed is comfortable. Highly recommended!