They tried to overcharge by applying the service charge and sales tax twice. And when I pointed out their mistake, they at first insisted they were correct (before later apologizing and fixing the bill). It's hard to believe this was an accident - charging for rooms is what they do for a living, after all.
The rooms are OK and the location is good (5 minute walk to an MRT interchange), but by the time you add on $27 per day for Internet access and another possible $40 of overcharges if you're not all the ball, you could stay in a far nicer and newer hotel such as Fort Canning just a block away.
Another point is that many of their rooms are noisy right now due to the construction of the Downtown MRT line adjacent to the hotel which goes on for most of 16 hours a day, 7 days a week. This is not their fault, but it's something you should be aware of. They have a limited number of quieter rooms on the opposite side, so if noise bothers you, ask for one of these should you book.
Also, their mattresses are hard - harder than anything I've seen in a shop. This didn't bother me personally, but it's worth bearing in mind if you're used to something soft.