There is already so much written that is very accurate, so I will just mainly say that we loved our stay. Regarding the stairs, my 11 year old daughter and 77 year old dad (not great shape) managed fine. We stayed out most of the day to avoid too many ups and downs. We went to Remi in the Galleria mall nearby each morning for breakfast fixings and used the kitchen. Night cap each evening while looking right at St Peter's spire was a highlight. Sergey is a pro. Don't hesitate to take him up on his offer to arrange transportation.