Had a wonderful time at my 6 days trip at Isabel's place!
Isabel is a great host that really makes you feel at home. the flat is exactly as seen in the photos and there's a lot of room for a single person (and also for two).
the place is perfectly located in the heart of Madrid and close to everything including bars, metro, and shopping centers - which also means that the area tends to be a bit niosy at night.
overall i highly recommend the place - great value for the money!