My boyfriend and I stayed in Claudio's apartment for five nights.
He was a lovely host and the communication was great. When we arrived, he showed us a few places where to go and what to see in Valencia.
The apartment was bigger than expected and in a great location. Sadly I have to say that there were a few issues with the cleanliness of the apartment, especially in the bathroom and kitchen. Furthermore the shower head was broken, but Claudio came to replace it just a day later, which was very helpful.
All in all, I would recommend staying at Claudio's apartment.