Location is impeccable as long as the address is correct. Easy access to public transportation can make it easy to explore the best part of Lisbon. You are on the same street with near access to public transportation and the trans as well as a number of great lookouts and neighborhoods.
The space can easily accommodate 4-5 people as long as they provide sheets for the couch/bed.
Enjoy Sintra, Belem tower, and the sights, sounds, and food of Lisbon.
Plan to purchase your own trash bags, toilet paper, soap, etc. Markets are nearby.