The highest price in Sanremo is in a 5-star hotel, expect around 210-220 EUR per night in a double room. Average price for a room in a 4-star hotel is 60-200 EUR (accommodation in a room for 170-200 EUR is as good as in a 5-star hotel).
Price of accommodation in San Remo in 3 star hotels is almost the same as in 4 star hotels - the same 60-80 EUR, some "3 star" hotels cost 100 EUR per night. A night in a double room at a 2-star hotel in San Remo will cost from 50 to 75 EUR. The cheapest accommodation in Sanremo is in 1-star hotels, although there are "single rooms" for 90-100 EUR (e.g. in the Hotel Centro in the city centre).