Yummy food. They have free gf bread and French fries. Staff is very knowledgeable. It's a classy place and doesn't get a lot of tourists, so look nice.
Run by 2 brothers, Mario and David, this restaurant has numerous GF options. My favorite is the octopus, which is 10 times better than any I've had before. I have also had the steak and their amazing homemade crustless warm GF cheesecake. Ask for one of the brothers as they both speak English and tell them you need Sin Gluten and they will take care of you. It's a bit hard to find even though its on Serrano because its down a set of stairs and then to the right. Don't be turned off by the nondescript exterior as the inside is quite nice.