In contrary to some critical reviews of the Quay Hotel found on various websites, we were pleasently surprised with our stay. Rooms are clean and renovated, check-in as well as check-out was quick and trouble-free, hotel staff was friendly. We did not notice any street noice in the rooms.
My only comment is that air conditioning in one of our rooms (the one located on last floor) could be less noisy - even if cooling was switched off, the fan was working permanently - which was bit disturbing during the first night when we were struggling with jet lag, but was no issue afterwards.
Overall, we were satisfied with our stay, given the accomodation prices in Singapore, the price/quality ratio was excellent. Will be happy to stay here again.