Just an update on the possible accomodation options that are available in Singapore.
Agree with preciousgem
that it depends on your budget and especially if you are staying for a week, you may just be able to negotiate a lower price
Besides apartments, you can check out The Green Kiwi Backpacker Hostel Singapore
which is affordable and decent.
Alteratively, you can check out travelmob
where private homeowners share their properties or personal residences. They usually have service apartments that are quite good and more affordable compared to the commercial ones available.
Hope this helps whoever is planning a longer stay in Singapore!