The apartment is really comfortable, and I loved being there. And the location was great. San Telmo is an interesting area with lots of unique places to go. And if you want to go to downtown Buenos Aires, the buses that take you there are right in front of the apartment. It couldn't be easier.
And Damian couldn't be a better host. He made checking in super easy, gave me advice on where to go for this and that (which I used and it was incredibly helpful), and responded to any problems that popped up immediately (for example, maybe the internet would go down for a bit. Even before I said something to him, he already contacted me to let me know that they were doing routine maintenance, but he would notify me as soon as everything was fixed).
I can't recommend this place enough. The location, the apartment itself, and the host are all above 5 stars.