The flat was very clean and pleasant, located walking distance away from Casco Viejo and the Guggenheim museum. It took us about 10-15 minutes to get there from/to airport in a taxi). There is also an underground station very close by. A large supermarket is literally next door. Communication with Javi was excellent - he was very proactive checking in with us and providing advice when needed. We got loads of useful tips on what to see and where to go. Would definitely recommend.