Top tip when arriving in Madrid at the airport and transferring to a train. Expect to be delayed at the ticket machines for at LEAST 20mins. A new ticketing system was recently implemented and it’s ridiculous. Not even the station staff were able to help on occasion. Very confusing. Long lines. The apartment was very central, on Plaza de Santa Ana. The apartment itself was nice but smaller than it looks in the photos and late night street noise from party people, even on a Monday in November, was significant. Handy to two train stops and communication was good with the hosts. Thanks Ramon and Marco