We stayed here for 4 days with 4 children, 4,12,15,16 and the location was perfect. Short walking distance to the waterfront, Berria Alta, and all the bakeries, and restaurants you will ever need. We would need months to eat at all of them. There are tons of shops and really easy base to get around the whole city. It was about a 25 minute walk to Principal Real, so everything is close. The apartment was clean, cozy and comfortable.
This is considered 1st floor, but it's two flights up. This goes for most buildings here and there isn't elevators. Keep that in mind when booking. This was perfect, but if we were on the 3rd Floor, it would be challenging carrying luggage up all those floors.
The hosts communicated with us very well and helps us check-in sooner.
Enjoy your future stay.