Kathryn is a very welcoming host, chatty and gives you as much recommendations as you ask, and pleas ask!
1- don't worry the location, is not the center but you will get there very easy, there is a metro station so near, Vatican 10-15 min from her place.
2- the room is big, good for 2 people, for one is big!, she provide you with liquid soap and towels (good detail), the room has the window facing the street, take this into account, anyhow I slept very well.
3- you can use the kitchen and else, of course you clean after yourself, the building is tall but there is a lift, so don't worry.
Stay here, is a good price for what you get!
BOOK THIS PLACE!