Vivi is a wonderful host with lots of great tips in regards to Tango and Milonga's. The room was not very spacious but very charming and clean and so are all the other amenities in her house. But for a couple of nights we did not need more. Her place is very central to the red subte and if you walk about 15 blocks you enter Palermo.
Just a block over is a wonderful little corner place where you can get very good , inexpensive steak..check it out! Unfortunately Vivi's place is on a busy street so you should expect some noise, but show me a place in Buenos Aires where it is not loud :-)
Can definitely recommend this place to someone who is very much interested in Tango and learning Tango.