The apartment indeed sleeps 6, with two sleeping in a very small sunroom (and one more could easily have slept in the bed in the attic room. For we six, this worked out very well. Location is terrific. Street is beautiful and walking around there was fun. Plenty of interesting and worthwhile restaurants close by. Live-in caretakers are friendly and helpful.
The apartment was amazingly well stocked with lots of little details, such as large assortment of spices, coffee, espresso (with a maker), even a little morning cereal, high quality cookware, plenty of dishware. Easy parking on the street for all three couples.
We were very happy there.