I am hoping to travel from Vienna (Wien) to Pisa but this question is general and a rough answer will do fine.
Do yo know how much the sleeper trains in europe cost even with my interrail ticket?How much to EuroNight reservations cost with my iterrail pass?It depends on the specific train and type of service. You can find information on the charges for night trains here: http://www.interrail.net/english/night_t
For a train from Vienna to Florence, you would pay 25 euro in a six berth compartment, 35 euro for a berth in a 4 bed compartment and up to 125 euro for higher class service (e.g., a private compartment with a shower and WC). You'll need to change trains in Florence to get to Pisa.
