I can recommend this place! The apartment is really lovely, newly renovated, super clean, fully equipped with whatever you will need and very modern for Lisbon standards. Lots of power outlets for charging electronics. Sonia - the host - is super friendly and helpful, and answers any questions very quickly.
As mentioned in another review, there is "food smells" from the restaurant below (scent sticks in the apartment balance it a bit), and it did not bother me. The surrounding neighbourhood Alfama is authentic with the typical hilly streets, and nice with lots of restaurants nearby. The street is lively so expect some noise when windows are open. Not too bad though! Several small supermarkets is conveniently just around the corner. A small nice sushi place is 2 minutes away. 15 min. walk to the downtown area by Rua Augusta, and 30 min. walk to Time Out market.