Great hosts and a great little place to stay in BA!
My boyfriend and I stayed in Florencia's apartment for 4 days just last week. We met her husband on arrival and Florencia on departure, and they could not have been more lovely and helpful. We were given a map of the city along with heaps of good advice, a subway card with instructions for use and a list of restaurants to try. Our Spanish is atrocious so Florencia was nice enough to help us book a remise when the time came for us to leave. The apartment itself was bright, clean and well stocked. We were very grateful for the air conditioner on a couple steamy nights. The bed is comfy too. We also liked the fact that we were on the fourth floor of the building and could use the stairs instead of the elevator. In terms of location, the apartment is within walking distance of the Recoleta tourist attractions (eg Cemetery) and there is a subway stop nearby to help you access other parts of the city. The neighbourhood felt very safe even during our nocturnal wanderings.
All in all, I strongly recommend you stay here, especially if you're first-timers to the city like we were :-)