The place was smaller than I thought, but very nice, and mostly as soon as I dropped my luggage and went out and realized I was walking the "Gran Via" street already, I was simply mindblown!
It is super centered and the carrefour is just downstairs to save you when you come home from exploring beautiful Madrid.
They have a fridge but no cooking plates, the internet connection is very good, and it the soundproof quality is good as well.
Portable heater and ventilator are available, which saved my day with over 40°c in August!
I recommend and will hopefully even come back!