The apartment is just great.. it's big, cozy and comfortable for 3-4 people. Absolutely perfect location to travel around and visit most places and attractions by foot. As it is in an old building with a small staircase it can be not the best option for elderly travellers.
The patio on the roof is fantastic with an amazing view on Rome! I have stayed at Guglielmo's apartment with my girlfriend and I made her a proposal in this romantic place at sunset :)) Definitely would go there to celebrate our anniversary!