We enjoyed our three night stay at the flat. It was very centrally located within walking distance to places like the Spanish steps, Vatican city and Trevi Fountain.
The apartment is definitely quite cosy, and the mezzanine level where the bed is has a low ceiling. Even if you are short you won't be able to stand up. But the bed itself is fantastic, and since you don't need to be stretching a great deal you should be fine. The kitchen is very small, but has everything you need - in particular the coffee maker and supplied coffee was much appreciated.
Check-in was perfect, they even kindly let us arrive early and leave our bags around 10am, well before check-in, so we wouldn't have to cart them around Rome. Much appreciated.
Overall, this is a great apartment for exploring Rome from. The Wi-Fi is very fast, it came with space to catch up on work at a laptop, the shower pressure was excellent and provided amenities were appreciated. My only irk was not including the cleaning fee in the AirBnB fees - I prefer to pay everything up front and not be having to scrabble for cash on check-in at a place.