We( my wife and I) stayed at Monica's place for entire week with three out our kids. They were 8,10&11... they loved it as much as we did.
Andres, the manager/contact person is plain fabulous as he will do anything you need to make your stay completely problem free.
He even opened a flat for us early AM as our plain form Boston arrived at6Am. Normaly, in Madrid, they open at 10 AM the earliest.
Andres organized transport ( it turned out to be even cheaper than any other private transport) for us and waited for us in front of the building.
he gave us valuable info about Madrid and list of restaurants that he recommends .He made himself available for our inquires almost 24/7 ?!
So many times I texted him with numerous questions ( via Whats up) and he would answer within 5 min!!
The building is very nice and is in very nice AND safe neighborhood . Metro 2 min walk. Grocery stores few min walk. Plaza de Espana is 10 min walk ..downhill.. my kids loved it and it was very entertaining...
Place is pure 5 star if you take into consideration, location, cleanliness, helpfulness and apartment amenities.
Will not make you regret ...unless you are comparing it with high star hotel :)
Would go back in a minute.