We arrived from the airport by bus and had to use Apple maps to locate the place where you pick up keys. It was a little inconvenient but once located it was only a 15 minute walk from there to the accommodation.
The apartment itself is in an excellent location next to the river, a 10 minute walk along the river to the Guggenheim and 5-10mins to the restaurants and bars. The apartment has everything you need and is very welcoming.
We made use of the nearby tram which conveniently took us to the station to get our bus to San Sebastián.