If you are looking for a spotless apartment in the center--this is it! We were a family of four and this was a perfect space for us.
Be prepared to climb hills and stairs all over Lisbon--we brought a suitcase and this is the one place we wished we'd brought backpacks instead.
Maria was an excellent host with great English and timely with all communications. In addition, she waited for us when we were delayed on the road, added tips for us to do with the kids and checked in to see how our trip was going.
The apartment has everything you need and the kitchen is very well equipped if you'd like to do some cooking. There is a big grocery store just down the street along with several little mini markets and fruit stalls nearby on the small streets.
Because the streets are small, noise can be heard in the evenings. This is not a problem for us--we brought earplugs as we always do when traveling. In addition, there is a fair amount of light entering the sleeping areas of the apartment. In Spain, we are used to sleeping with black out shades and were happy we had sleep masks to keep it dark!
If light bothers you, be prepared.
We had an excellent time in Lisbon, it's an amazing city and we can't wait to return.