Terrific location if you're looking to stay in San Telmo. There is a supermarket a block over on Av. Independencia if you need, otherwise a stack of cool bars and restaurants around the corner. Walking distance (15 mins) to both Plaza de Mayo and the Centro area. Subte just down the road a few blocks over (Independencia).
The room itself is actually quite generous for a top floor loft. They have a spare single bed which means your luggage doesn't clog up half the room. A small dining table and kitchen and a tv with a heap of channels (some sporadically in English) if that's your go.
Nora was very helpful and communicative and was able to provide bits and pieces when required! Overall would recommend staying here if you're after modestly priced private accommodation!