I had an excellent 2 days in San Telmo.
This is a large family apartment with Tatiana living onsite. My room is separate to an extent so very private. It has AC so was cool even with it being summer. It was very quiet at night with little street noise.
Apartment is on the 3rd floor but has an elevator.
I had access to the kitchen which I used to make coffee in the mornings.
There is a half bath next to the room, but the bath with shower is shared.
Tatiana speaks excellent English and was very helpful with any questions I had. My plane arrived in the morning and she was able to allow me to check in before noon.
Highly recommended !