Ok now it's time for me to tell a bit after holidays in mid June.
Prague. I hesitated between Ananas hostel and A Plus hostel. I finally booked in advance at
A Plus hostel. It's mixed dorms. Nothing fun there. But the showers are quite nice : in the bathroom of all floors, a range of three showers with dividers between them and just curtains. Could see just a few asses because guys changed outside of it. Nothing more, not so fun, because the hostel wasn't crowded. But on the last day, a bunch of young (Spanish) students suddenly appeared in the afternoon, but unfortunately, it was my last day there. So I decided to challenge myself and, at the end of the afternoon, took down the three curtains of the bathroom of my floor (quite challenging cause it took time and I made noise haha... But exciting). I put the curtains in my blag, and went out of the hostel, and in the streets, I felt like a murderer looking for a place to hide a corpse. Actually looking for a place to throw away three big curtains haha.
Sadly not very efficient because in the night + in the next morning, both at (normally) shower time, I met no guys in the bathroom. eventhough I spent like 1 hour pretexting brushing my teeth, waiting for some dude going to the showers. Actually, twice, a student would go into the bathroom, would see me and then would turn back to his room waiting for another moment to shower (too modest ?).
Apart from that quite desappointing hostel (but you should give it a go and try your luck, guys !), I wanted to have a look at
Ananas hostel, eventhough I hadn't booked. I sneak inside following some dudes and went to the bathroom. As you saw it in my previous post, I had fun removing the blurry tap on the glass doors.
I went back a few mornings to shower in that hostel. I saw a few dicks and it made my day a few times. One German guy was very unmodest and spent a lot of time naked, watching himself in the mirror, etc. and he saw me starting wanking in the shower and looking at him, but he didn't react and acted normal and then went away. It was fun, nothing more than just showing off and flashing. (better than nothing

)
Budapest. I went for
Opera hostel because it has male dorms

It's an old hostel and not a party hostel so I was a bit disappointed at the start. There was only 2 guys (modest and shy and sleeping with lots of clothes). But after a few nights, there were two men (maybe from Russia) who were quite handsome. I realized they were gay when one day, in the middle of the afternoon, I suddenly went back into the room and found them in the same bed watching a video and they suddenly got away from each other a little bit when I entered. That day, it was hot temperatures. They were just in briefs. I just smiled, undressed and relaxed in my bed in briefs too.
I got hard and they probably saw that, but I fell asleep in that afternoon...
In the night time, we were all sleeping in briefs. But I was sleeping naked. And it certainly made one of the gay guy aroused, in his bed, 8 meters from me, as he started stroking his dick descreetly right after i got undressed and layed down my bed, it was like 1 AM. I then wanked too and we finally got closer and wanked at each other until we cum (it was quite dark but it was so good ; other uninteresting men were asleep ; the boyfriend of that guy was sleeping in a further bed and was asleep too).
I recommend that hostel but you have a be lucky
About baths in Budapest : I only tried Kiraly bath and Rudas bath.
Kiraly might used to be gay or naked or something interesting long time before. But it's not like this anymore. So forget about this one !
Rudas bath is very nice during men only days. You can see many asses as the apron they give you only hide your genitals (though the bulge is obviously visible). Though men from the other part of Rudas bath can come with a swimming suit :/
Anyway I didn't looked for action in the showers, I don't know if it happens as I wasn't interested in 90 % of the guys there (who are 35/40 years old and older). But it's still nice to see the 10 % of the beautiful guys who are 30 years old and younger.