I stayed here with a friend and we found it to be a very comfortable and well stocked place to stay (the bread/jam/juice/milk in the fridge was much appreciated!)
Communication with Elisabetta was excellent, we had some trouble working the stove so I emailed Elisabetta, she replied very promptly and the housekeeper Miel came to our rescue.
Good things to know, just in case:
If you're a light sleeper be sure to bring some earplugs and a sleeping mask in summer as you'll want the windows open for air but that means street noise and street lights do come in.
The bathroom as described, is quite 'open'- the walls are 3/4 in height so any sound does carry out into the rest of the apartment. I'm 5ft5 and could just stand underneath the shower head, any taller and you'll need to sit in the tub.
The location is great, especially for young adults, Travestere is a lively and picturesque area, full of fun bars and restaurants, and the apartment is so close to a bridge to get to the 'more touristy' side of Rome, it was a great place to stay for our first trip here!