Antonella was the best host I've seen till today - she was very helpful and careful even before we'd arrived.
She patiently answered on all my endless questions about the flat. The location is impossibly central - 7-10 minutes walking to Coliseum from one direction and 10-15 minutes walking to the other line’ metro station. The flat is exactly as on the pictures. Not big not small – very convenient for 2-3 guests. We stayed for 4 nights and had no problem with the space. Everything is a new – bathroom and washing machine, kitchen utensils, beds and linen. The building is very old and you actually can feel the breath of the history – walls are so thick – it was unusual and rare experience to stay in such a place. I would definitely stay again with my kids and would advise the place! Grazie Antonella! :) 
Small advise for the future visitors if you're sensitive to the cold floor take sleepers (flip flops) with you. In winter the floor is cold. It is fine to be in shoes but we were not comfortable with street shoes at home and used thick socks. I don't think its a good idea for Antonella to purchase some pairs and keep them at home due to the hygienic reasons.