I don't think any of the above are necessarily going to guarantee you a city view.
Finding a hotel that you want and that shows a specific room type (ie- 'city view' ) that you're hoping for is going to be a difficult feat... most hotels are not going to be that descriptive nor are they necessarily going to disclose/label their most sought after rooms at a deep discount. You may get lucky, and it does happen, but you're really holding out for the needle in the haystack.
Sometimes you can upgrade to the type of room you want just by asking, or sometimes with an additional upgrade fee... but this is HIGHLY 'your mileage may vary'; so much depends upon what is available at the time you check-in, mood of the front desk clerk, hotel policy, occupancy levels, etc. etc. At check-in you could ask if a room with a view is available, and if the answer is 'no', you could then ask 'what about for an additional fee could i upgrade to a room with a view?' Such a room may not be available, or the front desk clerk may not want to go thru the keystrokes to re-assign your room, or you may be given a price for the upgrade (which you can then still try negotiating lower).
Bottomline is that the opaque providers offer a deep discount in exchange for being flexible, so unless you're able to find a room that specifically offers a city view, and you would be disappointed if you end up in a standard room, you may have to 'pay up' for the room type you want at regular retail rates (at which point i will also add that our current Priceline Coupon is valid for PRICELINE EXPRESS as well as and 'retail' rates where you pay in advance.
Please remember to return to BetterBidding and use the PRICELINE and HOTWIRE links on the board to begin your travel purchases... or thru our sister site MAPSandHOTELS.com for your regular rate purchases.
Let us how you'd like to proceed or how we can be of further help.