We are a grown couple, and stayed in the apartment for 10 days. The place was very clean and just as we expected from the pictures. It's not big, but was everything we needed. And everything worked as it should. (The big fan was of importance, since it was close to 34 * celcius in the day) The contact-person lived in the same street, and she was really sweet and informative. And easy to reach, both by texts and in person.
The location is just perfect. Small neigborhood resturants and shops just around the corner and a 2-minute walk to Rossio. From there, Baixa, Chiado, Bairro Alto, Alfama, The avenida, Amoreiras (Shopping centre) and the train station are within walking-distance. (And if you don't like walking: When you get to Rossio, the Taxis are waiting in line just where you come down. And in Lisboa Taxi costs nearly nothing.)
The stay was a plecent experience.