I felt weary because of my 16 hours trip from Jakarta and the disappointing Jawa Timur Park 1. The guest house gave me fresh air when I stepped my foot in the building. The check-in was fast and the staff was really helpful. Like many TripAdvisor reviews about this place, Kertanegara nearly provide what hotel accommodate. The room quite big and provide hotel basic amenities such as sandals, towel, mineral water, soap, and so on. The tea time at 3 PM to 5 PM was really nice because they gave us delicious snacks and of course a cup of tea. Breakfast in the morning will really good if they give a more variation of the meal, but it doesn't really matters for me. At the end, this guest house is a great place for you to stay in Malang, won't think twice to come back again!

I think in Indonesia, this premium guest house is comparable to 3-star hotels.
The room is big, probably bigger than most Indonesian budget hotels. Tea (plus point: the authentic kind of Indonesian tea), bottled water, hot-water kettle are provided in the room. The bathroom is fine, although it kinda look outdated.
The staffs are very friendly, helpful, and above of all, courteous. Two thumbs up for the service!
This guest house is strategically located in the city center area. To be specific, it's near "Jalan Ijen". However, the downfall is that on Sundays, starting from early in the morning, the city of Malang holds Car-Free Day on Jalan Ijen. This means traffic reroute, very loud chants, and music blasting from big speakers starting from around 5 AM. I don't really like getting up so early on Sunday, so it was not a good experience.
In the end, I guess I don't really mind about the sudden disrupt in my sleep. The Car-Free Day itself was an interesting event. There were bazaars (which sells art works), sports activities...simply a lot of people having a lot of fun!

We didn't really stay at the hotel, because they were fully booked. Unfortunately. But since our hotel staff was incompetent in arranging Bromo tour or transport to Banyuwangi, we went to the hotel and asked them to arrange it for us. In both instances they were super nice, helpfull and arranged everything. Also the private car to Banyuwangi was 1,200 k instead of 1,900 that Helios Adventures wanted to charge.