I travelled with a friend and we had a great stay at Buho.
There's plenty to be seen in Valencia and it feels like everything's within walking distance, the location is great!
There was a heater in our room, towels, coat-hangers, everything we needed. Toletries were provided, and in the kitchen we had everything we'd have needed to cook, as well as a shared fridge.
The hosts are very accomodating, there is always someone there ready to help, like for example we needed an iron on sunday morning, and got one in a couple of minutes. They also offered to store our luggage for a few hours after our check out. Very friendly!
They also rent bikes.
I hope to return to Valencia and would love to stay at Buho House again.