The apartment is beautiful, modern and clean. The patio overlooking the city is a wonderful place to spend time relaxing. Our trip was during the winter but we used the hot tub every day. Our 4 year old loved it. The apartment is on what we call the fourth floor in the US, but the stairs are wide. The apartment is very spacious with 3 bedrooms and 3 bathrooms. The kitchen had everything we needed to cook and clean including dishwasher and a combined clothes washer/dryer. The living room/dining room is large with a large screen TV.
The neighborhood seems very safe although we were never out late. The apartment is very quiet, could not even hear street noise that I remember. Several excellent restaurants are within easy walking distance of the apartment. The streetcar that goes to some of the popular sites stops approximately 10 min walking from the apartment. Uber however is cheaper especially with several people and definitely the way to get around. If you have a rental car the car lot is about 10 minutes away (near the streetcar). Rental cars are cheap and helpful to getting to places like Fatima and Sintra.
Overall we loved the apartment and would stay again.