The location is great, short walk to Termini and even the Colosseum, and Louis was a great host, accommodating to varying check-in and out times. This is more of a shared bed and breakfast set up than a room in a flat etc
The main issue was other guests and the location of the small room. The 'private bathroom' is two doors down the hall. While not an issue to access, there is no way to lock the door when its not in use, and I did notice other guests used it a couple of times. The shower is also just a drain in the floor, so I would recommend bringing some flip-flops to wear when you use it.
Other guests were quite loud in the morning in the shared kitchen, something you wouldn't experience in a typical flat rental, so keep that in mind. There's also a fridge to store some stuff in, but definitely noticed some things I had put in there were used, so dont put anything too tasty in there.
The room is also adjacent to the front door so you will hear people coming in and out.
Also just outside the room is a restaurant terrace from a hotel next door, so if you leave the window open you will hear the guests dining outside and can also be quite noisy, particularly around morning/breakfast time