We had a lovely time in Lisbon and Maria & Rita’s apartment was a good base to explore from. It was easy to get down into the centre of Lisbon. A little harder to get back home because of the steep hills but good exercise!
The nearby supermarkets were useful for supplies, but the local tasca’s (restaurants) were also very good, as was the Time Out Market.
Sintra and Cascais are worth a day trip and are easy and cheap to get to by train.