I wish I could give this review 5 out of 5 stars because our experience was superb in all respects except one.
Positive: Excellent location, easy access from/to the airport via nearby Rato metro station, within walking distance to many sites, on a very quiet street. Well-equipped apartment is very clean and spacious, has a terrific kitchen, great shower, comfortable beds, gorgeous towels.
Negative: The hot water was unreliable. Mostly the water heater worked but sometimes it did not. However Mafalda was very responsive, replied promptly to all messages, was helpful in all efforts to resolve the issue, sent someone over to work on the heater three times during our one-week stay, and on the morning we left a new part was being installed, so hopefully other guests will not have any further trouble.