Staying at Marta Guest House was really lucky. I booked nearly at last minute but could get better. The location is great to visit ALL Roma by foot (you can also take the bus or metro if you don't want to walk) and there are plenty of nice restaurants around. The room was exactly like on the pictures and it was very quiet (slept like a baby!). All the staff is very welcoming and give you tips for the city and make your stay nicer and easier.
Thank you very much.
Will recommend and will book again Marta Guest House.