Awesome location.
I love San Telmo and this place is right in the middle of it. Great place to stay for a few days. Edu is really nice and easy to communicate with. Everything went smoothly. The shower is great. Things to consider: As there is a big house right next door, there isn't that much sunlight within the apartment. It didn't bother us, as we were out and exploring the surroundings anyway. But if you think about working from here, that might be an issue for you.