If you want to stay in the San Telmo area, this is a great place. Right in the center of everything.
Super easy to check in and the 24 hour door man is a plus. He does not speak English but he will call someone down who does. And it's a nice touch, make you feel safe.
The apartment is bright and sunny with good air conditioning,
The bed is a double. (not uncommon in this part of the world)