The apartment is in a great location on the edge of the Old Town. Easy access to the Metro at one end of the street and the tram just round the corner. It has everything you need for a comfortable stay. We arrived early and the host kindly let us drop our bags off while the apartment was being cleaned which was very much appreciated.
Woudl recommend booking the Guggenheim in advance - saving a couople fo Euros and avoiding the queues. A trip up the funicular provides great views. We took a trip out to Getco and the Vizcaya Bridge is an impressive structure but we were a little disappointed with trhe area around Getxo itself. Not really worth it unless you've got time to fill. Two full days is more than enough for Bilbao. We moved on to San Sebastian after Bilbao - catching the tram to the Intermodal bus station and the bus on to San Sebastian. Easy connections and all ran snmoothly. Overall had a great time in Bilbao and the aprtment is in an ideal location to explore the main tourist attractions.