Jose Luís is reliable and available. Good organization for the keys. Nice and quiet neibourhood, thing s to eat close-by.
The flat is nice, you have everything you need, even towels and washing machine. Things for cooking (even olive oil, spices, coffee, fruits, etc.) a good oven. Nice beds though you shouldn't be too big because the second room has two small beds.
Smooth way of leaving the flat, just need to leave the key and clap the door.
Be aware that it is quite a long way to go to the different places you would like to visit. You are at 20min walk from park Güell.