We had an awesome stay in Madrid, the apartment had great wifi, air conditioning, with clean and comfortable bedding . The location couldn't be better, but the best part of the stay for me was the communication, they created a WhatsApp group and it was so easy to make contact with everyone.
Best of all, we traveled from South Africa, and had our Mad Cool festival tickets hand delivered to us, and I met a crazy dog in the park!
All of the above made our stay in Madrid perfect! I definitely recommend this to anyone...