The Gulbenkian Residence is a good option as a base while exploring Lisbon - if you don't mind 1) construction noise during working hours (apartment below and building across the road - not something the hosts can do anything about, of course, and not an issue at night) and 2) chilly temperatures due to no insulation of windows in the common area (bedrooms have heaters and are warm). There'll be other rooms and you'll share kitchen and bathrooms. You might meet someone new and have nice conversations (I did - although the place felt very quiet - deserted - when alone). Sven did a great job fixing problems with the Internet and was a very responsive host, flexible also with change of length of stay. Hosts don't live on site, so you'll be by yourself and/or the other guests mostly. Location is good and Gulbenkian park is nice to go for a walk or to have lunch in the café.