As an IC Ambassador, I was given a view room on a free stay from the summer promo. You can upgrade to Ambassador by paying $150. But what I think is even better than having the view in the room (which is a relatively small room) is to have the view in the lounge. Awesome. We paid 50 euros for a day to have lounge access. You can write to the hotel in advance to ask their price on your existing booking to give you lounge access.
And yes, the view across the river to the Castle side really is wonderful. I was very glad that we chose the IC rather than the LM where we had held a booking for months.