I stayed in Paolo's apartment for a little bit more than a week while I attended a Spanish course - it's spacious and very well designed also for a longer stay. Very nice terrace indeed, which I unfortunately couldn't really use as it was a bit too cold for that during my stay in February.
The location is perfect - you have a couple of bus lines just around the corner to get into town or to the beach front. Or just take a stroll into the old town if you are up to it - that takes apps. 15 - 20 min.
Ruzafa is a great area, lively and with some gentrification yet still a lot of "normal" colorful life, and with a lot of very beautiful modernist buildings. And of course, you have to try the extremely popular "Dulce de Leche" café just around the corner of Paola's place: EVERYBODY you speak to in Valencia raves about it, and I can confirm it has dangerously delicious cakes.
Paola is an extremely responsive and responsible host, and it was a very good experience staying with her - she has even made a special little guide for the people who stay with her. So I hope you get to enjoy your stay as much as I did.