The location is in an amazing green area, very quiet and clean. It is far from the city center, but very well connected (30 - 40 minutes by metro). I did not met Sylvia, but the communication was perfect and check-in and check-out very well organized.
The room (at 2nd floor) was clean (some doubts about bedsheets, but I don't know, always difficult to assess), with a big window and a private sink. Toilet/bathroom downstairs, clean enough, big with all that you need.
It was my 4th time in the city, so I already had some experiences with AirB&B here and, in conclusion, I really and sincerely suggest Sylvia's house.