We used this hotel for a small 2-days internal meetings.
You need to manage your expectation if you wish to stay at this hotel. It will indeed NOT a Marriott or Ritz experience. Absolutely not with the price you pay :)
The road to this hotel was very narrow. I used a sedan and still I need to be careful if I passed other car. So please be prepared if you use a bus. It would indeed a struggle.
The good thing when we first entered the hotel location was that there was a huge water playground (water-boom?). It would indeed a plus point if you are here with children.
The meeting facilities were quite standard and a bit humble. The meeting room we used (in the ground floor) was a bit dark but everything was working OK, for example: the AC was chill, the sound system were working well, water was served sufficiently. The toilet was not really clean and there was a leak when we were there, nevertheless it got fixed the next day. Coffee break and also meals were also OK. Again, it was a humble one but the taste was still acceptable, no complaint at all.
I did not got the chance to stay overnight as I had to attend other meeting at night so I drove back to Jakarta at night and drove to this hotel again the next day.
Please also note that although it is located in Sentul, it is not yet at the hill so please do not expect a cold temperature. The temperature was almost the same with Jakarta.
In summary: Comparing the price and the facilities, I would consider return for a meeting event.

I stayed for a night at Bumi Gumati Convention Resort for a school event. The service & facility of the resort is far below satisfaction. The access to the resort is quite hard, with uneven streets, making hard for buses and big cars to access the location. The facility of the resort is also below satisfaction, with the facilities are not maintained well. The doors of the room in the villa is so poor, making it hard to be opened. The closets and tables in the room are so bad and unmaintained, also the closets are smelly. One final thing, is that the resort could not overcome problems such as blackout. During my stay, I have to sleep without air conditioning and lights for two hours around 2 AM until 4 AM due to blackout. This makes my stay uncomfortable at all.