The instructions were clear and the check-in was easy and flexible. The wireless was reliable (we were able to hold 2 video calls at the same time). The fridge and the washing machine worked well and the terrace was a great place to dry our clothes.
However, the apartment also has its drawbacks. As many people have pointed out here, the shower is quite small and it leaks at one side of the handle, so the water pressure is extremely low. Also, there was mold on the shower's door and the same applies to the top-right cupboard in the kitchen where all the cups are stored. The fridge is extremely loud but, as I said, it works well. But the biggest problem was the fact that the door to the apartment cannot be locked. We wrote to Jesús about it and he said it had been broken for a year now and that we shouldn't force it.
Also, be careful about the number of people that stay in the apartment. I offered my friend a 1-night emergency stay and got charged extra 20€ (the neighbors snitched).