I am a priceline member. I needed to book a hotel in Japan for family trip so I thought I would use them.

It is a regular hotel reservation, not the "name your own price" kind.

I do all the regular selection. Entering adults, number of children, their ages, location, date. Pick a hotel and made my reservation. And then, the confirmation came and it looks a little fishy. My 2 adults, 2 children reservation turned into a 3 adults reservation. I decided to contact priceline. Who told me my reservation is made through booking.com (?). So, I contacted the hotel via booking.com and the reply I got is: I am not allowed to check-in with that reservation because my party exceeded the guest allowance! (Priceline shown max guest is 5, and it charged me extra for 2 children)

I am glad I read the confirmation and checked with the hotel. I don't know what would happen to me when I found out during check-in. Just thought I would share my experience so you don't run into the same issue.