This is a lovely apartment is a fantastic location - you can walk to both the old town and the Guggenheim in about 15 minutes, to the nearest metro station and the bus station in about 10 minutes.
The apartment was sparkling clean and we had everything we needed including wifi and access to Netflix. Maria stocked up the fridge and cupboards for us with milk, juice, jams and other goodies and she also left us rather a lot of pastries!
We would definitely recommend Maria's place.