Ralf and his team are awesome. We stayed with Ralf in August 2013 and they upgraded us before we arrived due to the previous tenants needing to extend their stay. Ralf is first class. I had never used Airbnb prior to booking this room (and it was our first time in South America - we are from the US), and I couldn't be happier with the selection. Ralf went out of his way to take care of us, even exchanging our money at a better exchange rate than the banks. The apartment is beautiful and is close to everything. Lots of good restaurants around (check out Las Pizarres Bistro - super close and amazing experience). The area is very safe and has lots of great things to do. We used Ralf's shuttle service and it was super easy. Overall, if you are going to stay in BA, don't spend $300 on a hotel, book with Ralf - you won't be disappointed!