I would recommend to use booking.com for hotel search. After you choose hotel or several hotel options we can check if it is cheaper to book it via booking.com or directly from the hotel. And I can tell you if the hotel is good, its advantages and disadvantages. We also can book an apartment for you.
Irkutsk
There are more than 300 hotels in Irkutsk. The choice is usually very wide. But there are months of high season when it is better to book accommodation in advance (3-4 months before the arrival date).
High tourist season in Irkutsk and Lake Baikal is from June to September and from February to March. High season prices are usually 10-30% higher.
Average prices for different kind of accommodation in Irkutsk (city center, high season):
Hostel
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from 450-1000 rub/person/night in a hostel.
Apartment
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1500-2500- rub per night for flat/apartment with one bed (1 room apartment for 2 ppl)
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2500-4000 rub per night for flat/apartment with two beds. (1- or 2- rooms apartment for 4 ppl)
Hotels
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2500-4000 rub/twin standard room
4000-6500 rub/twin standard room
6500-11 000 rub/twin standard room
Listvyanka
About 1000- 3000 rub/night for a twin room (toilet and shower are on the floor)
About 4500-6500 rub/night for a twin room (toilet and shower in a room )
Olkhon island
About 1200- 2100 rub/night for a twin room (toilet and shower are on the floor)
About 2200-4000 rub/night for a twin room (toilet and shower are on the floor)
About 4500-6500 rub/night for a twin room (toilet and shower in a room )