Cafe Rivas is a quaint and relaxed cafe/restaurant/bar along a quiet cobble stoned street in San Telmo. Set a little away from the usual tourist trail, it's a great sanctuary from the busier parts of the area (particularly during the busy Sunday market along Defensa).
The cafe is a perfect place to while away a few hours and is right opposite a quaint bookshop that stocks some English speaking books if you're in need of a bit of reading material and having quite mastered the local lingo.
Reward yourself after the busy San Telmo markets with a nice glass of malbec or a coffee and homemade treat at this sweet little cafe.