Couldn't have asked for a better stay at Carlos' apartment. The check-in process was smooth with Carlos and his daughter providing lots of helpful information about the apartment and Bilbao area. Apartment itself was very clean spacious with plenty of room for our group of 5 guys. Also multiple balconies/terraces with some decent views of the city. Good location with Old Town about 10-15 minute walking distance. Carlos was also very responsive via Whatsapp whenever we had questions.
Highly recommended and this will be our first choice when we visit Bilbao again!