We've just had 3 nights on the Marina Manderin en route to Bali, can't fault the place. We arrived early 8am and were escorted to the business center to wait for our room (check in is at 2pm) offered tea coffee and water, after a short wait we were told our room was ready 9:30am. The room was on the club floor, very large, huge bathroom with an amazing view of the Bay Sands hotel.
Smiles from the staff everywhere, polite conversation if you wanted it, ever the guy cleaning our room bowed when he walked past.
Singapore is such a clean, tidy organised place this hotel fits in well.
Pool was nice, spa was good, access to mall underneath and MRT was good to get around town.
Just a couple of things which could improve: the breakfast buffet is not the best, it's an eclectic mix to try and suit everybody but it doesn't really manage it and the coffee is nasty (this could be due to the soya milk though).
We also found the steak resurantant in the place to be ridiculsly expensive sp$90 for a steak, chips extra, No thanks, we ate out instead.