Nerea's apartment was immaculate when we arrived. They allowed us to check-in early and leave our bags. The apartment is only 20 minutes walk from the Guggenheim and 5 minutes from the Old Town so perfect for sightseeing.
The only downside is the area the apartment is in. When we arrived police officers stopped us to warn us it was a bad area, which was not an ideal welcome. But aside from Saturday night when it was particularly noisy we had no issues.