I spent 3 weeks staying here while on contract for my company and was hugely impressed.
the Hotel was beautifully laid out in European style and a lot more compact than some of the huge hotels you find in Jakarta.the rooms were comfortable ,spacious and very clean. The staff were among the best trained and friendly I have ever met and the food was superb to boot.
I have been travelling globally for over 5 years now and this hotel rates in my top three. i can only think that its small size pool would explain a 4 star status. i cannot recommend grand mahakam highly enough !

I stayed in this hotel for 10 days and it's been a great experience.

POSITIVE (+):
* very nice and clean rooms, good housekeeping
* perfect buffet breakfast, separate non-smoking area (where the buffet is so very convenient)
* friendly staff, eager to speak English and always helpful
* nice club/disco in basement
* security
* cable/satelite TV channels
* close to shopping mall (Blok M)

NEGATIVE (-):
* location (area), quite dirty but so is most of Jakarta
* swimming pool very small and deserted (on 6th floor)
* many weddings which can make it rather busy & crowded
* iron (+board) on request

The Negatives are minor, this is definitely a good hotel.