"Here’s a more polished, slightly posh-British version with that warm, gracious travel-review tone:
I rather embarrassingly managed to book my stay for the wrong day and only realised my mistake upon arriving at the hotel. The front desk staff could not have been more kind or accommodating. Although the hotel was unfortunately fully booked, they happily stored my luggage while I worked out an alternative plan, and even offered use of the shower should I decide to head straight to the airport.
Sadly, because the booking had been made through Hotels.com, neither they nor the hotel were able to cancel or amend the reservation. Nonetheless, the receptionist went above and beyond — she even contacted a guest who had not yet arrived, as there was one remaining reserved room, to see whether they still intended to check in.
The level of service at CityHub Reykjavik was simply sublime. I stayed here previously and found it wonderfully comfortable, and this experience only reinforced my impression. Exceptional hospitality and genuinely lovely people.
A tiny lapse in my planning; a masterclass in customer service."