Mario’s place is walking distance from pretty much anywhere in Rome (we didn’t have to use any public transport). The apartment is very close to the Vatican as advertised - less than a 10 minute walk - and in a security building. There is a lift so getting up to the third floor was very easy. It’s a small space but quite comfortable! You also have your own balcony which is always a plus. Highly recommend if you’re in Rome for a few days!!