The petite apartment is in a really convenient location within reasonable walking distance of many of the sights in Lisbon with amenities nearby. A short walk from the Rossio stop of the Aerobus and close to the metro/train station. The area itself is pretty quiet and no street noise disturbed me during my stay, although as the flat is located right by the building entrance other occupants entering/leaving can make a ruckus. Something to note if you're a light sleeper or want silence at night.
A great spot for a (petite!) solo traveller, I would definitely consider staying again if I'm back in Lisbon.