After leaving Yokohama (and while feeling like an idiot to have to move my huge bag after such a small amount of time (3 days) – last time I am travelling for less than a week, says the little voice in my head), I headed to Hakone, as recommended by a friend of my little brother. I happily take advice involving onsen as having a tattoo in Japan means being discriminated against in onsen and having to make research.
Onsen Guesthouse Hakone Tent has two private ones that the customers can use for free , as much and long as you want (if they are not in use of course).
As much as I loved it, after 40 minutes I usually left, feeling completely relaxed.
I did not the area at all, but the hostel was conveniently placed, right next to Gora station, which made my life way easier (but for the fact that I was an idiot on the way back and decided to take the bus, making me walk through a lot of stairs. Note for the ones of you with a big bag: take the train!)
The staff was nice, though less than in Yokohama, the owners had a very cute baby, and there was a kotatsu in the bar area (that you could use even without buying drinks or food, which I found a little bit expensive and too European for my personal taste).
I stayed in a dormitory too, and here the main issue was finding a plug as there were not enough for everyone, and they were not located evenly.
I luckily made friends with a lovely lady from Hong Kong who told me to take her place when she left the day before me, as it would help for both making my bag and having a plug nearby.
On the whole, I was very pleased with my choice and would also readily go back, because it was very relaxing. Also, it was not sunny enough to see Fuji, which made me super sad!