In the middle of the old town, you are just steps away from restaurants and shops. Bilbao is a highly walkable city, the Guggenheim is just 15 mins walk along the river bank. And the the beautiful Arriaga Theatre is just steps from the hotel.
The hotel is located near the entrance of Bidebarrieta, few doors away from Women's Secret. It is a big white door with number 3 on top. The rooms are clean and everything works well.
The hotel is no frills, you pay the balance when you check in and just grab a map and you are good to go. And when you check out, just leave the keys in the room.