I had a great pleasure to stay at Maria's apartment for two weeks in July-August 2017 along with other three friends of mine. The apartment is spacious, clean, has everything one need both for a short and a long-term stay and is perfect for a group of 4. The location is very convenient - there are different shops just around the corner; the Old town, Guggenheim Museum and public transport stations all close by in walkable distances.
Maria as a host should be mentioned separately - she was just great from the very first day till the last one, always ready to help, to give tips on and tell about the Basque country. Especially her colourful descriptions of the local food will make you wanna run to one of the many local restaurants or pintxo bars immediately :). We've been all infected by Maria's cheerful and happy attitude. :)
Muchas Gracias, Maria!