I stayed Matias's place with the last minutes travel. He was very responsive and gave me clear direction what I need to do to check in. My flight was late, so he let me keep my luggage in the room too, which was very helpful.
The place is in central location near the oblique and Teatro Colon. Subway station is close too. There are many restaurants, super markets and delis every corner.
The place has a couple of rooms with patio. There are two bathrooms too. All are nice and clean. People stay there are friendly too.
I highly recommend his place.