We had a nice time at Martin's house.
Shanghai was home to host us and explain all when we arrived.
Martin was easy to enter in contact with. So we never felt "lost".

The apt is nice and spacious. In the cool neighbourhood of the city.
Maybe a little bit "basically furnished". But considering the neigbourghood and the price Martins asks for it, i think it is absolutally a good deal and a great place to stop in Buenos Aires.

thanks Martin