I found Mario's place worked perfectly for me during my recent stay in Madrid. The apartment was immaculate, check in worked seamlessly and Mario responded to any of my queries almost immediately. The apartment is ideally situated close to Sol, Gran Via and a multitude of other tourist areas so even though I was there for work its location allowed me to explore the city in the evenings. I have no problems recommending Mario's place to anyone visiting Madrid. I will certainly look to use it again next time I visit Madrid.