Gisselle's please has a superb location, a 10-15 minute walk from P Atocha station. It's in the historic district with restaurants, cafes, bars abound. Two famous museums (Prado and Reina Sofia) are nearby.
I had a lot of room with the extra working space, that opens to a balcony. The bathroom is clean and, very importantly, spacious.
Gisselle is a great host. Will sure try to stay here if I am back in Madrid.