first i hope you are going for work, because that's way too much time to spend in singapore for a holiday. If you want to go there for a holiday, there are great places to go from singapore that are inexpensive including bali, thailand, borneo(malaysia), and places in malaysia. see airasia among other sites, and note that some flights (but not all) may be cheaper from nearby malaysia.

but there are long reviews of all these hotels in trip advisor.
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finally you could have problems with priceline trying to book that many days in a row. You may be better off making bids for two separate package of nights.