Had been a faithful customer for years, but after I was extremely let down by a hotel in Krakow, I wanted to post a review on this hotel on Booking.com.
Of course my review was never published - as it can be seen from the screenshot - hopefully it is uploaded.
Then I realised that there is no kind of protection to the guest. In my case the hotel did not provide what I booked - a room with air-condition and I wanted to leave. The hotel did not let me since they wanted to charge me for a night because of Booking.com commission. After checking the FAQ etc, there was nowhere where I can complain on the hotel with Booking.com
It is good to know that Booking.com charge 10% to 20% commission on top of the price of the hotel. Looking around in other sites, you may find the hotel / apartment cheaper than Booking.com.
UPDATED:
After emailing Booking.com (it wasn't a friendly email) to post my review, since the time period to review the hotel was about to expire), my reviews was posted.
My rating does not change anyway since the customer is not protected in no way. Won't book again from Booking.com