The flat is really lovely and in a perfect location. Reina Sofia is 3-4 mins walk and you can get there from Atocha very easily. We took an express bus from the airport and walked with our 4 year old son.
Miriam is very sweet and gave great recommendations. The flat itself had a great fully stocked kitchen and bath with spices, hairdryer and soaps. Great if you are traveling with a little one.