Good location if you like to be in the old town and on walking distance of the Guggenheim. Bring your earplugs as it can be a bit noisy at night. The apartment has everything you need to stay for a few days. If you are looking for a real AirBnb experience with a local touch: this appartement is owned by people that rent several apartments out, so do not expect local interaction with the owners.
One thing that could be better: the shower is beautiful but cold after one person had a short shower...