The Marriott County Hall definitely has a nice concierge lounge on the 4th floor I believe. We had a Thames view room about 3 doors down from the lounge when we were there last February. I am but lowly Gold and was afforded the lounge access on a reward stay.
The morning concierge at that time was a lovely young lady from Italy named Sandra. She befriended my daughter who would only go to the lounge for breakfast every morning-she was 11 at the time.
So go enjoy, and if you see our friend Sandra, please tell her Lauren from NY says hello.
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Regards,
Art from ISP