The flat was lovely inside. Nice little balcony, lovely big sofa for us all to lounge on. Loved the huge TV :) Really comfy beds. Both bedrooms were really calming and conducive for a good night's sleep. I loved the extra touches to make it homely, the coffee machine and some pods, cakes and jams, milk in the fridge etc. A friend of the host came and met us and was very informative and even came to meet us earlier than expected and let us leave our bags in the apartment which was really handy so we could get out and explore. He also sent me a list of recommended places.
It was incredibly close to the old town which is down a fairly steep slope but not far at all and once the evening nightlife starts you can really see how close to it you actually are. Lots of music going on in the streets and plazas when we were there. It took us about 25 minutes to walk to the Guggenheim from the flat along the river. Bilbao in general was grittier than I was expecting, the first night we stayed we were a little uneasy about the city but our second night you could feel it's energy and spirit and maybe if we had stayed longer we would have been completely won over! The flat was wonderful and if you are there for the nightlife and enjoying the old town this place is perfect.