This is a great place to stay! There are a lot of attractions nearby that are in walking distance and plenty of local bars, restaurants, small grocery shops and bakeries.
We particularly enjoyed visiting the Time Out market one evening for a fantastic meal, the Lx Factory, walking around Alfama and visiting the beaches and park in Cascais (which is a 40 minute train from Cais de Sodre train station - a 15 minute walk from the apartment).
The apartment is a nice place to relax with great views from the living room. We loved Lisbon and will definitely come again and would stay in the apartment again too!