Mandy&Yu place is very nice. Next to the public transportations and you could take tram 15 to Belem Tower or bus to the city center. The neighborhood is cool. Lots of local restaurants and delicious bakeries. But be mindful if you traveling with kids and want to visit aquarium and science museum, the distance is a bit too far ( about 1 hour) by public transportation. To safe time we used uber instead and it costs around 18-20 euros per way.
Thank you Mandy &Yu!