Based on the information received from the organisers, the booking period for the media hotels for the 2016 European Aquatics Championships in London end on 4 April. Here are the details coming from the OC
“There are two official media hotels available to accredited media and should you wish to stay in either of them please visit THIS WEBSITE and quote the code ‘LENMED’ when making your booking.
Everyone who books accommodation at one of the two media hotels using this link and code will be given a pre-paid Oyster card in order to travel to and from the London Aquatics Centre during the Championships.
Please be aware though that this offer will no longer be available after April 4.”