The place is walkable to everything, from the Vatican to the coloseum. Right off the street are delicious places to eat or grab a drink. It is on the bottom floor which is nice if you need a break from stairs. This means it can be a little noiser but with the windows closed this wasn't an issue, we all slept well.
It is a fantastic place with a usable kitchen and two bathrooms! We would stay there again next time we are in Rome.
We weren't able to meet Carmen but her husband and Elmer were both delightful. They were accommodating and have great local tips and directions. Carmen was very responsive to messages and checked on us to make sure we were having a great time. I highly recommend both this apartment and the host.