We had an amazing time in Valencia.
Carlos met us at the metro station and on the walk to the apartment he pointed out some of the sites and good restaurants and shops to visit. The guidebook was really useful and had everything you needed included. Carlos was easily contactable if we needed him (although we didn't need to, as everything was great).
The apartment is in a very central yet quiet location and was perfectly located to explore the old town. It's close to the metro and easy to get to the buses.
The apartment was clean and well presented. It is a good size and had everything we needed. The air conditioning was an added bonus and the wifi was quick. We loved eating breakfast and sitting on the roof terrace in the evening.
I would recommend this apartment for anyone staying in Valencia and Carlos is a great host.