I spent one week in December 2015 in Maria & Enriques apartment (I'm 27 and a German girl) and can highly recommend it!
Both are family-oriented, generous and warm-welcoming hosts who want to make sure that you are having a good time in BA. Maria showed me the big apartment which extends over three floors and gave me very precious recommandations to explore the city.
For me, this apartment was amazing, a bit old, but very unique, everywhere stylish decoration, family pictures and you discover everytime one more room :-)
My room was exactly as depicted on the fotos with a big warderobe and a nice completely private bathroom net to it. Maria prepared everything you might need: Mosquito-thing, Adapter, maps of the town, but also one self-made map of the barrio where she noted down where to go to change money, buy food, where to eat etc. They also made sure that you have their mobile number in any case.
The highlight (together with this warm welcoming and this beutiful-interesting apartment) clearly is the terrace on top with own WIFI.
The surrounding is one of the safest in BA and busses/subway are nearby.
There is nothing negative to be added, the room is highly recommended - especially for young people and their first time in BA.