We had a great time in Valencia and Miguel's apartment was in a great location with a few little bars in the same alley. It was very short walk to the central market, and many great restaurants.
We were travelling as a family with 2 adults, 2-20 year old young adults, and a 17 year old.
We had some minor concerns that came up during our stay, but Miguel handled them.
One concern to point out is that the air conditioner is a single unit, that did not have enough power. The AC was was in the main space (kitchen area), but did not have much effect on the bedrooms, and therefore led to some uncomfortable nights. I mentioned this to Miguel as we were leaving, and he indicated that he would look into improving the AC.
Overall, the family would definitely return to this apartment.