4 people can easily stay here with plenty of room for everyone. Having 2 separate rooms and bathrooms also grants privacy.
The beds are listed as “double” but by American sizing they are queen mattresses.
Beds are firm but comfortable . They are way better than an old worn out mattress that you might expect at a rental. Watch your head when you get out of bed to use the restroom . You will likely hit your head! It’s avoidable but you forget about the risk in the middle of the night.
I highly suggest sending one person up to get the keys to the elevator and using it for bags. Otherwise it is 5 full flights of marble stairs. Not super easy!
The location is great for walking to dinner, the Pantheon, Trevi Fountain etc. we did take taxis to The Colosseum and The Vatican.
The private terrace is amazing if you have good weather.