The location of the accommodation is excellent for Metro travel, with Gran Via, Sol and Callao stations nearby. The amazing Mercado de San Miguel is within 10 to 15 minutes walk and there are a number of great craft beer bars in the area too.
Check-in was easy with clear communication from Nader and there are a number of helpful leaflets and brochures in the flat to give you a good idea of what to see when you are in Madrid.
The flat itself was clean and the air conditioning was welcome relief in the Summer heat.
I would definitely stay here again.