Vicky's house in San telmo is the best place a backpacker can dream of: central, close to many bars and restaurants, huge room, and amazing roof top with barbecue! This made our stay unforgettable.
The place is a bit noisy and could be a bit cleaner, but the amazing moments you can have having barbecues on the roof top will make you forget about this ;-)
We definitely recommend the place for backpackers.