The apartment was as it appeared in the photos and overall we had a GOOD experience. We arrived a few hours earlier than originally planned, but were accommodated without much wait.

Some things that could have made it a GREAT experience: The apartment had less than 1/4 roll of toilet paper when we arrived and there weren't any extra rolls in the apartment. When we phoned Juan (the man who helps Maria with the apt) he stated that toilet paper was not supplied with the rental. To me this is a bit silly. Such a basic and inexpensive need should come standard, but at the very least guests should be informed they need to provide themselves with toilet paper.
Next, the air conditioner in the bed room began leaking/dripping water in the middle of the night. When we informed Juan he said he wasn't aware of the issue and offered no help to fix or suggestions as to what we should do. The dripping was bothersome while sleeping and we felt uncomfortable with water being leaked inside the apartment and had to use a sheet to collect the water.
Finally, the day we were leaving the apt we came back late afternoon to pack out belongings and found Juan inside the apt. We were told a new guest had arrived and that he needed to prepare/clean for them. The time we were leaving was never discussed, but if a new guest was coming a warning would have been considerate. Not the best feeling to find a sort of stranger in the apartment with all of our belongings scattered about. Luckily, Juan was a very nice guy. He gave us privacy to pack and didn't make us feel rushed.
Better communication on a few details would have made a world of difference, but we enjoyed our stay and would recommend it to friends. San Telmo is absolutely charming and was by far our favorite neighborhood. We recommend Origens for breakfast/coffee and Bar El Federal for a late night bottle of wine :)