We would definitely recommend staying at Ignacio and Sara's home. The house is really well placed close to the subte lines and main bus routes. There are supermarkets, panaderias, bars and restaurants close by.
The house is a beautiful old building, stylishly renovated with open courtyards high windows with lots of light. It has big areas for everyone staying to socialise. Our room was quiet, big with its own bathroom.
Ignacio and Sara were away when we arrived but their family were on hand and helped us settle in and made us feel very welcome. We had a great stay and would stay again when in BsAs.