Hi everyone,
I have also booked at IBIS as well... I used booking.com and paid 399GBP for 5 nights (As I will be travelling from Turkey, I tought it would be better if I can stay in London few days more.) The rate does not include breakfast and according to the maps its is just a walking distance from Excel.
For the one who didn't arranged their accommodation, most of the hotels in the area are either sold-out or few rooms are left-out. Better be quick because the rates for the prices go higher to 700GBP for these dates (according to the booking.com)