My experience shows, that it really depends on the hotel - e.g. Radisson Blu in Kiev only gives a bottle of water, Radisson Blu in Berlin offered fruit plate and Radisson Blu in Dresden gave me two free plates of chocolate, bathrobe and slippers, additional cosmetics (salt and hand cream), which are normally for Business Class and Suites. I find the last variant pretty nice in case the hotel is fully booked.