If you want to stay in the heart of Lisbon - welcome here.
A lot of see sightings are located nearly, 3-5 min walk, you can easily get to the airport or to any point you need.
The host (Elsa) will meet you and share all needed instructions and useful information.
The apparent is tiny (but this is a common situation for this part of the city) and you can be sure, that everything is clean inside.