We initially chose to stay at Javier's place because of the great location and the fab decor. When we arrived at the apartment it absolutely lived up to our expectations - we have stayed in Madrid a few times and loved the luxury of having an apartment this time (hotel rooms can be quite small). The apartment is well furnished with all amenities you would expect (coffee, seasoning, iron, washing machine etc) so no need to bring extra things with you.
The renovations can be quite noisy, we were told that it would just be painting during our stay but we heard a fair few tools being used. It would normally start around 8am. The bedrooms are near the front door and so you can hear any noise in the hallway. Ultimately, his wasn't an issue for us but worth considering if you're looking to stay here.