We had such a great stay at the Ponte Sisto apartment. It is very well situated, with quick and easy access to Campo de Fiori, Trastevere, Vatican City and there are many public transport points within easy walking distance. The only negative is the narrow and steep staircase, which makes it very difficult if you have large suitcases, but we understand that it is an old building and that there is no room to add a lift. Overall we would highly recommend this apartment and we wont hesitate to stay there again.