We enjoyed the stay and thank the hosts for the opportunity of staying at their apartment.
Positives: large and clean apartment, friendly and helpful host. Location is great unless you want/need to stay in Lisbon's touristy/old area.
Negatives: the quality of the beds (thin mattress) and bedding (all synthetic -- easy to sweat on, plastic-covered mattresses) was really poor and perhaps not even worth of a hostel -- uncomfortable and very disappointing.