Marta and Federico's apartment is perfect for a nice stay in Buenos Aires.
The apartment was very clean and confortable. The bathroom is great with an excellent shower. The kitchen is full equiped and you do not have to leave the apartment with your kneaded clothes: there is an excellent iron and an iron board. The balcony is great for a wine or beer at night (you can find several wines and alternative beers at the Chinese market in front of the building). I slept as a king in the queen-size bed. The communication with Marta was perfect since the first contact.
The neighborhood is a gem. There are several restaurants, bakeries, ice cream and wine shops, hospitals (just in case) and supermarkets close to the appartment. You can also find places to the breakfast at Avenida Pueyrredón. So, if you don't want to have it at home, there are a lot of (good) options at one/two blocks away.
The apartment is close (5 minutes walking) to the new subway station Las Heras (line H). So you can easily and safety move all over the city.
In summary this was one of our best stays in BsAs. Highly recommended!