Our stay at ST Signature was okay. The room was very small and not very clean. Also we had quite a few inconveniences: Check-in took quite a while because our booking wasn't in the system. The air conditioning was broken, they told us it will be repaired the next day, but unfortunately they only fixed the air conditioning 2 days later (1 day before our check-out). Communication was quick, at least they offered us to sleep in another room for the time without A/C. One day we couldn't enter our room anymore, because the system said we had checked out. Another day, the cleaning lady just came into the room without knocking on the door or asking if someone was inside. Didn't say sorry, didn't smile, didn't say hi. Very impolite.
All in all, we would choose another accommodation when in Singapore next time.