We had a great time at Ainara’s place. Communication was quick and easy as was check in. Even though our flight was delayed for hours Ainara was still able to check us in and walk me around to the local BM supermarket to get some food! Which we really appreciated. You really are very close to the old town. You can walk up or there is the lift that you access through Casco Viejo metro. Then it’s 1 min down the steps to apartment. We did find out eventually that you can buy a ticket just for the lift from the ticket machines! However a Barik card for travelling on bus, metro and tram is a must. It really saves a lot on fares. Bilbao is a very walkable city but the metro and trams are easy to use if preferred. For example the main bus terminal is 4 stops on the metro from the old town (get off at San Mames). When going back to airport recommend getting the bus from the bus station as it gets pretty full as it moves along its route through the city. We took the Artxanda funicular for great views across Bilbao. The Guggenheim is a must if just to look at the outside! You need to wear a mask on public transport so be aware. Oh yeah and eat tortilla every day!