Great location and Sofia is an excellent host. She even organised our PCR tests for us on Christmas Eve.
Good exercise climbing the stairs to the 3rd floor ( tricky if you have an 18kg suitcase as we did- no lift).
The flat is spacious and airy. The shower in the bathroom is fabulous! I took my yoga mat with me and had a lovely space in the living room to practice.
Seville is a great city for walking around. I would happily return.