Thanks for all the info here....Hotel amenities were complimentary breakfast and high speed ingternet access. Price per night for 4 adults 76$ + taxes Hotel as indentified previously here Express by Holiday Inn London - Southwark. Thanks for all the info here
In Berlin in a double room booked with booking.com in the website it clearly stated that "a 3rd person could stay also in the double room at an extra charge". The hotel was Mercure Checkpoint Charlie and the extra charge is 25E per night. This is the only time I ever saw that statement in a hotel booking website. And the total price is way lower that booking a room for 3 persons. I suppose a small child would be free...