Unfortunately, cheap accommodation in Paris is only available in hostels or in hotels on the outskirts of the city.
The average cost of accommodation in Paris in the first nine arrondissements is 120-180 EUR per night (the most expensive hotels are near the Louvre, in the Saint-Germain arrondissement and on the Champs-Elysées, with an average price of 240-260 EUR).
A more economical option is hotels in business districts, for example, in the local Manhattan La Defense. here you can rent a spacious room in a modern building for 100-130 EUR. The most budget-friendly hostels in Paris cost 18-30 EUR in the "low" season and from 30 EUR in the "high" season. The most popular hostels are Young and Happy, Aloha, Le Village and Woodstock.
By the way, if you don't know in which neighborhood a particular hotel is located, pay attention to the address - it always mentions a 5-digit number, for example, 75010. The last two digits indicate the district number.