Oscar has been a great host! I needed an Airbnb for my first week here in Bilbao, and I was very content with my choice. The flat is extremely well maintained. Oscar doesn’t live in the flat himself, but he keeps it extremely tidy, clean and inviting. I lived together with his nephew Carlos, who is a very nice and courteous roommate. The building is located in the center of Bilbao which allows you to go pretty much anywhere in the city by foot within a maximum of 20 minutes. Casco Viejo, with its multiple bars, restaurants and shops is only approximately 6 minutes away. Oscar was also able to provide me with a lot of nice tips of where to spend my nights.
I found the price of 75€ per night to be a bit more than expected, but this had mostly to do with the particular weekend I chose to arrive, which happened to be around one of the biggest catholic holidays in Spain (1st Nov) and during which various sports events were held in simultaneously. The usual price of around 50€ is a very fair amount for the quality of the accommodation, however.
I would recommend this flat to anyone who seeks a high-quality, cozy and well-situated place to stay for any amount of time!