意大利火车预定问题

在预定车票的时候

有2个地方看不明白


JOURNEY PREFERENCES (Please indicate your preferences for the place to assign to you)


Train ES Italia AV 9425 FRECCIARGENTO date XXXXX from Venezia S. Lucia (18) to Firenze S. M. Novella (20)


Seats descriptions: mandatory reservation 可选择 window median corridor,我是两人同游，该怎么选？



Seat near to Coach: Seat: (To travel beside someone who has already bought their ticket)这个是什么意思？该怎么填？


谢谢了