We stayed at Luis's place for three months from November 2017 with our daughters aged 3 and 5. The apartment is spacious and was very clean. The location is quiet during the night and day but within easy reach of central Lisbon by public transport or to the airport (an uber to the airport is less than 5€!). There are a number of supermarkets within a few minutes' walk from the apartment. Exactly what we wanted.
Luis is a fabulous host. During our entire stay he was responsive and immediately dealt with our queries. Everything in the apartment was as expected and we felt at home within minutes of arriving.