A hotel which is just of the center of town. However, the green tram starts outside the entrance. The green tram goes along the river (including Guggenheim) to the old town.
The rooms are rather small, but clean and comfortable.
There is free internet in the lobby and parking in the basement.
The staff at the reception is very helpful.

I've stayed here twice (first time in January 2011), both times with friends who were flying out early the next day. The location is good: it's a 15 minute walk to the bus terminal, and the rest of the city is also easily accessible by foot for those who are walkers (for non-walkers, metro and tram lines are nearby). Rooms in both cases were a bit small, but clean and pleasant; hotel was quiet at night (at least in rooms with interior/rear-facing windows). Staff was nice enough and competent, though a bit slow; free wi-fi in the rooms (ask for log in and password at reception). As someone who does not want to spend a lot of money on a hotel and doesn't need lots of amenities (parking, room service, etc.) but values quiet, cleanliness and a convenient location, this is my go-to hotel in Bilbao.

Had a discounted weekend rate, which made us book this business-style hotel on busy main street. Clean, useful wi-fi and good base. Good location - easy walk to Art Museum and walk or bus to Guggenheim or Old Town. Very helpful staff. Restaurant not cheap but good quality. Supermarket nearby. Subterranean parking is €20 a night - too much for our two motorbikes.

We stayed here for two days. The front desk staff speaks English, which was a help. While the check in person couldn't muster a smile to welcome us, we won't hold that against the hotel. The non-smoking room we had faced the street, and was a bit noisy in the early evening, but everything quieted down nicely later. Well supplied bathroom, including a toothbrush and tooth paste. Free wi-fi. Easy access from the bus station, and an easy walk to the Guggenheim Museum, and surrounding areas. Restaurant in the hotel is expensive, however, there are places to eat in the area.