Step 1 - Open your Google Calendar and click on the 'Create' button to make a new event.

Step 2 - Change the time and date to when you need the room booked for.

Step 3 - With the 'show only available' option ticked, you can either start typing to search for the room or browse through the list by expanding the sections. Only rooms that are free during your specified periods will be listed. Click the 'Add' button to associate the room.

Step 4 - If the room is already booked, you will have to select another time. There is currently no way to view the timetable of the room in full. With the 'Show only available' box unselected, the rooms will appear as below if they are unavailable.

Step 5 - Click to save your event and complete your booking.