Delia
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Found this place thanks to my Spanish teacher. It's a cozy corner in La Latina neighbourhood, with delicious food and a wide variety of coffees, lattes, etc. I went there a couple of times already and whenever I want to study or relax with a book and a cup of coffee, this is always the place I choose.
I highly recommend their cakes and brookies and if you want to drink something special I'd go for a chai golden or pink but also their seasonal specialties.
The café is a nice, cozy and retro-looking place, perfect for an escape from the chaotic Madrid and the staff is gentle and friendly. They all speak English and are very patient with people like me who are trying to speak Spanish.