Juan Jo was a perfect host: he met us at the apartment at the exact agreed time and explained lots of useful information for the area and Bilbao both before and after our arrival.
The apartment is above an excellent wine bar (although it's very quiet inside the apartment), which is very handy. It is just a few metres from the funicular railway station and a short walk to the pedestrian bridge to take you across the river to the central/Guggenheim area. The apartment is also only 15-20 minutes' walk from the Old Town.
The apartment itself is well and fully equipped with a spacious and stylish open plan living/dining and kitchen area.
When we are next in Bilbao we hope to return!