Most of the European countries are going to decrease the hotel prices in 2019; Madrid has 12% decreases in rates which were the highest decrease between other capitals.
While most European countries decrease rates but Istanbul has an increase of 8 % in most of the hotel prices for August 2019.
Madrid as the first city which has a more decrease in rates has an average of 79 Euros per night for the standard double room. Paris also follows up this decrease and has a 10% drop in rates. The average price of one double room in Paris is 124 Euros per night.
After those cities, you can find drop rates in Dublin, Santiago, and Brussels.