Me and my friend stayed in Guillermina's flat for a week and a half and we were very satisfied.
Eventhough we didn't speak a language in common we could understand each other quite well (the google translator helped us).
She was welcoming, kind and cheerful all the time. We also got a taste of the spanish music and dance from her.
The neighborhood is a little bit far from the centre but there are buses you can take and in 40-50 minutes you can be in the heart of Sevilla.
There are shops, supermarket and bakery nearby and a nice park called Miraflores.
If we return to Sevilla again, we will contact her again for sure.