I stayed here for one night with a friend when Ubud Bungalow was full. I preferred Ubud Bungalow as it seemed just a bit more up-scale, but the gardens at Gustis are lovely, the staff are friendly, and the location (a vibrant side street in Ubud) is a bit more mellow than the many bungalows based on the busy touristy streets. The location here is quiet and pleasant, so much so that it's a bit of a shock once you turn out on the main street! The bungalows are nestled on a hill in the back that leads down to a pool and a simple restaurant where breakfast is served (banana/papaya/pineapple, tea or coffee, and choice of banana pancake, local cooked banana sandwich, and one other thing I unfortunately don't remember). The pool is not that big but clean and there is an outdoor shower next to the pool. They offered towels on request but no soap/shampoo. The inside of the bungalow was fine, but my comforter smelled like mold so I didn't sleep with it. They arranged a driver to take me to the airport (DPS) for the appropriate going rate and were very friendly.

A very overrated place. Staff not helpful, rooms rundown as well as having rats in ceilings, nice garden and good location. Have tried it a couple of times but never again. Twice have booked room only to arrive to be told rooms full.

We stayed in room 5. It was pretty basic, the bedding and towels were old and the pillows like rocks. However, there was hot water and the garden and swimming pool are lovely. There were pancakes for breakfast. We only stayed one night as we decided to stay in Ubud an extra day and our previous accommodation was fully booked. It did the job for a night but I would have been disappointed if we had booked a stay of any length here.
The owner was helpful and helped us book slow ferry tickets to Lombok the next day.

Oh Gustis, we had such high expectations for you! My sister highly recommended this place, after her stay there two years ago. She spoke of personal "manservants" who were at your beck and call, and commended the lush grounds. Well, she was correct on the latter--our balcony overlooked the tropical trees and fauna bordering a hidden ravine. I would've enjoyed sitting on our deck to gaze at them more, if I hadn't been worried about ants/bugs infesting the very musty/old seat cushions that adorned the wicker chairs provided. Unfortunately, "musty/old" was precisely the problem with Gustis. Aside from the absence of manservants and the general indifference of the staff (the Gusti family?) overall, our biggest complaint was the bedding--our bed was covered with musty sheets that just felt dirty, and our pillows were quite hard. We might as well have been sleeping on sacks of rice. In addition, we had to ask for towel and toilet paper changes daily, the quality of both being less than par. Isn't a towel supposed to be somewhat absorbent? Can some stains be bleached out? Can we have any pool towels?
Speaking of the pool, the temperature seemed cooler than other pools we swam in, perhaps because it did not receive as much sunlight. Also, there are only 3 lounge chairs, and the pool is quite small.
My other complaints regarding the room: There was no fridge, air con (a fan sufficed) nor television. The lights were so dim I could not even read at night without straining my eyes--this may be prevalent throughout Bali, however, as an attempt to conserve energy.
Without much light to read, nor a television, nor a nightlife in general in Ubud, sleep is the best thing to do at night. However, when you're staying in a family compound where members must yell at each other from across varying levels of the terrain, it is difficult to get much peace, especially at 7 in the morning.
On the plus side, we did have hot shower water and there were no bugs in our room. The room only cost $25 a night and is in a great location--close to the Lotus Cafe, market, and Palace, and on a charming street with engraved, cement tiles.