The apartment is stunningly central, small but perfect for a one- or two-person short/medium stay. The host is exceedingly kind and accommodating (I arrived four hours before the check-in time and they let me in).
There's everything you might need, and it's steps away from supermarket, transportation, restaurants and most of the main attractions.
The only possible downside is that the fantastically big windows open on a small square exuding tourists, restaurants and most importantly street musicians, who play almost continuously from 10am till 11pm. It's very nice if you are home sparingly or for few days, but if you work from the apartment it gets old :)
Still, the nights are surprisingly quiet for such a touristy area, you are provided with earplugs, and you might actually enjoy the music (I mostly did).
All in all, it was a charming stay.