Endeavour is a very nice flat, fantastic decoration, spacious, and very well located. Your hosts are very nice and attentive.
It is a residential neigbourhood very close to old downtown. Tube statation in 5 minutes, 10 more to Baixa. Also quite a lot of buses direction Estrella. You get the best of both worlds, close to monumental Lisbon and a quiet place - surrounded by nice places to breakfast, lunch or dinner (do not miss the rodizio nearby), and a nice supermarket.
Flat has all needed services - you will not miss (almost) any single thing.