Extremely interesting place with tons of curiosities. Very spacious with more than enough room for my family of 6.
Survival Guide for Renting in Summer Months (the place does not have air conditioning)
1. Close all windows and window doors during the day. Do not let any light in. It seems counterintuitive and that you would want some air, but you need to sacrifice air to keep the heat out.
2. At the time I stayed we found 3 portable fans. They are not on display. We found them under tables or behind doors. You will need these. In fact, if you are staying there long term, I suggest buying 3 more, but with the current amount I recommend the following. During the day, use two in the living room - that along with the ceiling fan makes the room very comfortable. I also recommend putting one in the kitchen. At night, of course relocate the fans to the bedrooms.
3. Once the sun is down, it is now safe to open the windows and let air in. The streets can be a bit noisy, but I actually enjoyed listening to the sounds of the city. It is really not that bad.
4. If you lose power at any point, check the breaker box which is between the kitchen and the front door. We apparently tripped a breaker when running the microwave and didn't find a solution for several hours. Once we found the breaker box, it was an easy fix.
Overall, the place is excellent. If you want an authentic Madrid vibe, I highly recommend. There is so much history in this place. I would definitely stay again, though maybe in cooler months.