Marta's apartment is excellent and definitely a 5* place. Though in an older building, it has been remodeled and finished with modern features - hidden cabinets/refrigerator - new modern sinks, faucets, bathrooms, showers. The apartment is spacious and easily accommodates a family with its 4 bedrooms and 3 bathrooms. It rained several days in Madrid - the apt even had umbrellas available.
The location is fantastic - within walking distance of most major plazas, like Mayor and Sol. Great restaurants are within a 5-10 minute easy stroll. Dia market with fresh produce is across the street. Coffee shops, little bars, bakery shops are on Calle Magdalena not far to walk.
Marta was an excellent host - she responded quickly and easily to all questions or requests - helping us to navigate Madrid and offering suggestions on other cities to visit. She and her husband were delightful in every way. I would stay here again in a heartbeat. Thank you Marta Y Kike... it was a great visit.