The location couldn't be better. You are right in the middle of Madrid and can walk from there to all major points of interests. The communication was swift and you had no doubt you'd be looked after. It's a rental flat, not big but adequate for two people but not more. It has very little in terms of natural light but two small skylights seem (somewhat surprisingly) adequate. It's very clean. WiFi is fast. You won't be able to do any cooking as there are no kitchen utensils or a frying pan (just basic crockery, spoons, forks, knives) but then you are in Madrid - tons of excellent and inexpensive eateries all around. The hot water will last for one quick shower. The main problem (as mentioned by others) is paper-thin walls. I'm not exaggerating in saying that you can hear every word uttered by your neighbours in the adjacent (also rental) flat. If you're lucky they maybe have well;-) I'd rent it again though.