I stayed at Andrea's house for two weeks, and I would highly recommend it for a solo traveler. The room itself is basic and small, but very comfortable, and it has its own balcony which looks out onto one of the most charming old cobblestone streets of San Telmo. The bathroom is a walk across the apartment, but it's private and has a great shower (water's always hot, great water pressure). The living area is open and comfortable, with lots of plants and sunlight, and stylish touches that make it a nice place to sit and work. There is another room in the apartment that's listed on Airbnb (in addition to Andrea's room), so you may have some company, but the people I interacted with were usually not around, and the living area is large enough to easily accommodate everyone if they do choose to hang out there. The biggest pull for this place is the location, which in my opinion is on the best street in BA. Within one block is the Sunday market, the San Telmo marketplace, a handful of other really cool stores, and a diverse mix of amazing restaurants, really some of the best I've ever eaten at - Banco Rojo for empanadas, La Brigada for a proper parilla meal, Freddy's for a quick steak sandwich, Che Taco for a burrito, and Saigon for Vietnamese. Andrea works hard to make sure you have a comfortable stay while respecting your privacy, and she always responds immediately on WhatsApp if you need anything. Overall, this was a great place to call home for my two weeks there, especially considering the price.