Best Western Rewards - International reservation using POINTS

I apologize if this has been discuss previously; Thank you in advance for your help. I have never made a reservation using BW points; I have a couple of questions:

1. Can I do the reservation on-line?
2. When I called the reservation line (via phone) I am asked for a credit card for "other charges" and "incidentals"; I understand the incidentals but what are the "other charges"; she told me she does not know. Has anybody had a problem reserving with points in Paris? Will the "other charges" be $5, $50 or $200? What stops the hotel from charging me $200 in addition to giving up the points? Since many BW are privately owned it can be a hit or miss.

I would appreciate some clarification and re-assurance if somebody has reserved before and things went well.
I am looking at the BW Premier Au Manoir at St. Germain de Pres in Paris.
thank you

You can (and should) do it on-line. You have to enter credit car info, but you will read directly under it:

Note:
This information is used for incidentals only.

If you feel safer, print that reservation page, with the note.
Or you can send an e-mail to the hotel with your question, and print out the answer.

We had plenty of pre-paid or point based reservations in many US, European, Asian cities, never seen any extra charges at check-out.

What will prevent them to put extra charges on your card? The same thing that prevent any decent hotels to do this, regardless of the way of reservation.

Bon voyage!

Thank you for your response. It is re-assuring.