ORD-TGU

The above threads compare properties, but few mention accessability.

I will have a 23 hour overnight layover in London in summer, my flight leaves at 7am the next morning, would it be reasonable to stay in downtown london, or just to stay in T4 or T5 property? Cost is an issue, so is convenience, I will not enjoy breakfast and for this stay dont care that much about property's ammenity?

(maybe early check in or access to shower in gym)

Any recommendations? I want to use points if possible or C&P.

Thanks