Stayed for a month over Christmas at Ricardo's apartment in Buenos Aires and was completely pleased with our visit. The apartment is just as listed -- clean, has 24 hr security. everything works like air con and wifi and is located right in the middle of Buenos Aires within walking distance of the markets, harbour etc. Plus it is right where the all the subways, buses and trains meet so transportation is simple.
There were three of us in the apartment most of the time but when we had our grown children visit, there were five and it was not too crowded. It can be a little noisy during rush hour -- but that is true in any city right down town.
The host, Ricardo Castro is extremely helpful, speaks english perfectly and is easily available using Whatapp or cell phone. He lives within commuting distance of the apartment.
Really enjoyed BA and would definitely stay in this apartment again if I visit.