I stayed at Victoria's apartment for 5 weeks, I was taking a Spanish language course in the center of Barcelona.
I had a really good experience:
first of all, Victoria is a kind, sociable person who is always willing to help with any questions about the house, Barcelona or just to have a chat. I felt welcome and at home.
Second, the place itself is nice: it's a rather spacious apartment in a good area. The Sants area is not the most central, but from there all tourist attractions are easily reachable by metro (blue or red line) or on foot. From Sants train station you can also visit other cities in Spain. It is a 2 kms walk to Plaza Espana and beautiful Montjuic. Furthermore, there are many shops, supermarkets etc. in this area. So really you have all you need at walking distance.
I would recommend staying at Victoria's place! You will have a quiet place to slow down from the vibrant city life in the center! :)