ST Signature is a fine brand and was a great place to stay while visiting Singapore. The check in is quick and easy. The amenities are exactly as listed and the room is exactly as advertised.
My only complaints are minor (I still gave the place 5 stars) and pretty specific to me. But just in case you, the person reading this review, are like me, I'll let you know what they are.
The chair/desk are kind of small. And if you're a bigger guy, like me, you will not be comfortable working in that chair for the duration of a workday. I ended up using a coworking space nearby, instead.
The space between the desk and the bed has, as far as I could tell, never been cleaned. There were clumps of dust that had to have been building up for years.
Finally, the fridge is simply not big enough for the number of people in the hotel. You'll struggle to find space for even a few items.