The flat is big, very well furnished and absolutely central: you can walk to the city center in 5 minutes. The view from the balcony is great.
Sonia has been extremely helpful and welcoming, really a nice person.
If you plan to come with a car, remember to budget about 13/15 EUR per day. The parking is about 5/10 minutes by foot. Forget to park in public areas because it's absolutely not possible.
I definitely recommended this place.