We are going to Bali and Lombok at the end of July. Some colleagues told us not worry about booking hotels or B&Bs in advance, others said the complete opposite.

We do not need luxury or "popular" hotels, but would like clean and comfortable rooms in mid-priced hotels (budget: up to 50 US$ per person/night). Some of the places we would like to visit are Kuta, Ubud, Munduk, Pemuteran and Gili Trawangan.

My question is:

Would you recommend that we book the sort of hotel I described above in advance, at this time of the year? Will many of them be booked out if we don't?

(Do you perhaps have personal experience with this specific destination in recent years?)

_{(I am not yet familiar with the tag system of this SE site, please retag if needed and remove this notice. Thanks.)}