For some destinations, you can purchase the Private Room Option: this guarantees a private room for you, or for you and the person you're travelling with, so you won’t have to share it with other participants. However, this option isn’t available for all trips or all departure dates, and you can check its availability during the first step of the booking process.
If you're booking just for yourself and prefer a private room, you can add it for an additional cost during the first step of the booking process, subject to availability.
When booking for two, the private room is included at no extra cost, subject to availability: be sure to add it in the first step of the booking process.
Important! If you want to book a Private Room for two for free, you need to make a single booking (i.e., the payment will also be made as a single transaction). It's not possible to make two separate bookings and then request a private double room.