Everything went smoothly and perfect, Maria answered me very quickly and since I don't speak Spanish we were able to discuss everything in English.
For an additional charge we were allowed to move into the apartment much earlier than stated, Maria is very accommodating, she reacts very quickly and tries to make everything possible for her guests.
I highly recommend this apartment, it is located in the best district of the city - bars, restaurants and supermarkets are on the same street, the subway is only a few blocks away ( Maria has even a SUBE card for her guest, which you need for the subway) as well as a huge shopping street is very close.
Everything you need and like you can find In and around this apartment, it is fully equipped, from the kitchen to the bathroom- it leaves nothing to be desired, also good for a longer stay.
Thank you Maria for your hospitality and who knows, maybe come to buenos aires again :)