Ria
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Johan is a really great host who takes really great care of his guests. He is a really open and friendly guy who loves to share his interesting stories and make people laugh.
He makes everything possible, no matter what, he even showed us a video of how he carried a man in a wheelchair up Ijen!
He has lots of great tours aside from Ijen, such as waterfalls, beaches with turtles and national parks, so you should really consider to stay a bit longer than just for Ijen.
The rooms are simple but totally fine! He has a nice common area with a kitchen to have breakfast and chat. Breakfast is typically Indonesien plus fruit and it was really good. Also the WiFi was really good too.
The location is also nice, not too far from the city center. We walked there and to a Chinese temple and a nice black beach. On the way, there were a lots of fruit stands and supermarkets.
All in all, it is a great budget option with an incredible host, I would totally recommend!