What is the price of a free upgrade room in the hotel?

If the hotel upgrades the room for free and continues to stay, it is generally based on the price of the previous room. If the renewal rate is not high, it is generally based on the price of the previous room. Of course, the specific situation may be different due to the hotel policy. If you need long-term rental, you can negotiate the price with the hotel, because the hotel may have some price concessions to retain a frequent visitor.