I highly recommend staying at Eugenio if you want to be in a popping neighborhood that has nightlife going on until the sun comes up.
First, its in a piazza that a taxi can't get to. If you do not feel comfortable walking your luggage through throngs of people on cobble stone streets, this might not be best for you. For us, this was no big deal.
Secondly; its on the 4th floor (3rd floor for non US people) and is 50 stairs to the flat with no elevator. Its not that bad but might be hard for someone who doesn't like walking up stairs.
Next, you share an entrance with the flat that that they own Nextdoor. You also share an iron with them and a washer machine. If that doesn't bother you, you will be in great shape.
It has a wonderful view and is constantly filled with noise from the foot traffic however once you shut the door / windows its white noise and not loud.
Some quick tips: don't run the washer machine and blow dryer at the same time or you will blow a fuse.
Last, there is a restaurant directly below the flat that has lines all day; every day. I do not recommend you eating there. The food was the worst food I had the whole time in Rome. I was told they have a line because they give discounts if you write a great review.
I would recommend this apt/ flat to anyone who is single or a couple who are looking to be in the heart of the action and don't mind walking on cobble stone streets or up stairs.