Atis Bar is a quirky bar housed in a historic convent in San Telmo.
The food is ok, but the space is everything. Announce yourself to the hostess at the entrance to be led through the building and up the stairs to the dining area. In sprint and summer the walls are covered in ivy and make an even bigger impression.
Take your time to look around the space before you go, it's really beautiful. Downstairs is a residence and you're not allowed inside, clearly, but the hall itself is worth a quick peak for the Andalusian tiles.