I stayed at the apartment for three months and it was perfect. The apartment is very homely and well equipped and could not be in a better location. It's just a short walk to the centre the main tourist attractions of Valencia and the old town, with a beautiful park (Parc central) just across the street. Whilst there are many nice restaurants, bars and cafe's close by, the apartment is still peaceful and never too noisy.
I had everything I needed in the apartment for a longer stay, I was working at home and had no issues with internet.
Isaac was incredibly helpful and attentive, he would reply almost immediately if I needed any help. He also helped me carry my very heavy bag up 5 flights of stairs! I would not hesitate to stay here again and would recommend to anyone looking to explore Valencia for shorter or longer stays :)