It was great staying at Manuela's place, it's a nice quiet area that is central in Cascais (with respect to all the attractions and beaches around), we had no car but almost everywhere is accessible by a short Uber ride of just 5 Euro on average :)
We also took the 403 bus to Sintra, this bus ride is very nice because it makes quite a nice scenic round passing by the sea at Cabo de Roca and then going up the mountains seeing all the nice villages and castles on the way, then we came back from Sintra by Uber for just 8 Euro.
And nearest big super market, Lidl is only a 10 minutes walk.