Location, location, location. You will not find a better location on Madrid than at Fior's. She owns a small Internet/computer cafe downstairs so you know her Wifi is legit. She even let you leave your luggage there at the store if you arrive early or check out late (and buy water, soft drinks from her). Fior and her son are very lovely during our stay. The place though small has everything you need, especially AC! Which is rare, and you'll definitely need it during the Summer months. We highly recommend her place and shall be back!