We stayed at Ricardo's place for three days at the end of November with four adults and two kids (ages 12 and 10). Check in was easy, we never met our hosts, just a code inside a secure building.
The rooms are big, sparsely furnished with new IKEA necessities and the beds are comfortable (according to reports from all of fellow travelers). There are electric radiant heaters on the walls in each room. It was cool when we were there and they worked well in the closed rooms. The tram outside on the street is a bit noisy at night and the morning but its really nothing more than typical city noise, which is more than made up for by the location in the center of Lisbon, close to metro, tram and bus stops.
We spent most of our time out exploring but the space lacks a communal gathering area (like a living room or something). The kitchen is where our group of four adults and two children gathered to plan our days. We made light breakfast each day and crammed into the table space. Honestly though we were sick of each other at the end of the day so being able to retreat to separate spaces was really a bonus.
The only issue we had was with the key. We had a range of ages and people coming and going at different times and an extra key to the outside door would have been helpful. To be fair, we didn’t ask our host.
Bottom line. Clean, functional, stylish space with a fantastic location for exploring Lisbon. Also Lisbon is an amazing city. We will be back!