My mother and I stayed at Isabels apartment for a week and it was just perfect for our city trip. We were warmly welcomed by Rogerio, Isabels husband, who showed us around the apartment which is located in the very middle of the city center, so it was easy for us to walk or get anywhere (bus/tram station is around the corner at Rossio).
The apartment was clean and tidy and all in all, we had a great stay!
Very recommendable - we would definitely come back!