My girlfriend and I spent a week in València at Ruben's flat and loved every minute of it. The flat's very spacious for two people and could definitely accommodate groups of three to five. The living room, bathroom and bedrooms are all attractively furnished and decorated. Although the flat is located in a quieter area, the metro stop less than five minutes away will get you anywhere you need to go, and there are great places nearby to eat or buy groceries.
Ruben himself was helpful and welcoming. Although we were late checking in due to delays in our flight, he responded as soon as we showed up and gave us a full tour of the flat, as well as lots of tips about where to buy food, how to get around the city, and where was good to visit. All around, it was a great trip and I'm glad we chose to stay at Ruben's flat!