Note that I do not have much experience with top-rated hotels. They are simply places I do not stay at.
However--especially for service--my nomination is the Hotel Agnes in Prague. It is a relatively small property that lacks the amenities associated with five-star and even many four-star hotels. But check its ratings on Trip Advisor and find me a hotel that gets higher rankings and more favorable comments.
Regarding service, I offer the following:
--When I arrived in Prague by train, the hotel picked me up at the station. The owner was waiting for me holding a placard with my name. Because I was staying three nights, the hotel would have picked me up free of charge from the airport.
--In the ride to the hotel, you receive an orientation of the city.
--You check in not at the front desk but at a table in the lobby. Because I arrived early in the morning, I had breakfast on the house. When people check in later in the day, there are served drinks and refreshments. During check-in, the hotel makes clear that it wants to do whatever it can to help you enjoy Prague.
--Throughout my stay, the hotel's personnel knew me by name. Again, throughout my stay, the hotel's mission seemed to be how could it enhance my stay--could it set up tours, dinner reservations, concerts.
--I had minor laundry work done without charge.
--I asked for a recommendation of a barber. A hotel employee walked with me down the street to a hair salon where I was introduced to someone who could give me a haircut.
--In Prague, I was transferring from the Agnes to another hotel for a RS tour. Learning of my plans, the hotel--on its own--offered without charge to transfer my luggage to the second hotel.