Loved staying aboard the Santa Maria II. Paulo's boat is well equipped and cozy, and is excellent value for money. The marina where the boat is docked is centrally located and even just across from a few nightlife options!
There's nothing quite like being gently rocked to sleep, and the marina itself is fairly quiet (though you will likely hear music from the nightclubs well into the morning if you're a light sleeper). Even when we stayed in the midst of what was one of Lisbon's colder nights (about 7-degrees Celsius), the cabin was kept toasty warm thanks to the electric heater we had going.
As you'd expect on a small boat, washroom facilities are limited, but Paulo did a good job of explaining everything ahead of time and pointed us to the option of using the shared facilities at the main marina building if needed.
Communication with Paulo has been by far some of the best I've had with an Airbnb host! He's thoughtful, informative, and goes out of his way to help where possible.
Highly recommended, two thumbs wayyy up!