Excellent location and perfect for 2 people.
I stayed 4 nights with my boyfriend and this was our first time staying at an air BnB.
We never met Brian in person but Carlos met us to check in amd Brian responded to all emails very quickly, and allowed us to book last minute.
The studio featured had not been cleaned so in advance he told me we could have a similar studio in the same building. It was clean and bright. Unfortunately it didn't have AC but Brian arranged for a fan to be provided, which was fine for us.
The area was very central, just one block from the Recoleta cemetery and lots of cafes, pubs, restaurants. It was very safe to walk around even late at night. It was also 1 block from the park, great for running.
This was our fisrt time in Argentina so the only thing lacking for us was information on the local area, maps etc. But we did stay our first night in BA at a hotel as we arrived really late so they had provided us with a map and city information so this was fine.
The doorman was great, he spoke no English but with my minimal Spanish we spoke to him everyday and he gave us directions to a large super market and when i couldn't fine the launderette he walked me there (very embarrassing as it was actually only across the street).
Overal my first air BnB experience was positive and I would book again.