I'm not sure about poshest.
But I'm certain of the worst hotel I've ever stayed in.
My father had just passed away and I needed to travel from my home in Washington State to central California. I didn't want to spend a lot of money on a hotel for the night. And numerous hotels were booked up. Online I found a hotel in San Jose for $100.00 US per night - a fuckng rip off in 2009, but it was the least expensive I could find.
After driving all day from my home, I arrive late at night at the motel. I couldn't find anywhere to park - not because the parking lot is full - but because there's no parking lot - there's literally nowhere to park. I circle around the motel at 1:00 AM and finally find somewhere to park in the street. I walk a few blocks to the so-called motel carrying my luggage - there's a pungent smell of urine emanating from the building along an unlit wall.
I walk to the reception desk - no one is there. Someone finally arrives after I ting the bell on the desk several times.
He looks up my reservation on his computer and gives me the key to a room 2 floors up. I walk up to my room - and it's the literal size of a fucking closet. There's a sink and a bed that's currently folded into the wall, nothing else at all.
I unfold the bed from the wall, exhausted from my long drive and try to go to sleep. Plastered on the sides of my room are little placards, apparently mandated by California law, warning that asbestos causes cancer and that asbestos insulation is present just behind the walls of my room. Fucking great!
Come morning I wake - I want a shower - and to get as far away from this hell-hole as possible. There's no individual bathroom in this hotel - but instead, a common shower/bathroom area. As well as a shower, I need to relieve myself.
But... every single toilet in the common bathroom - without exception, is brim full of toilet paper and shit. There's no way to flush the toilets - and there's no way I'm sitting down in any of these stalls.
I make my way back to my hotel room, unzip my pants, pee in the sink in my room, and then proceed to my car, whereupon I drive as fast and as far away from hotel hell as I can.