Yes, unfortunately beautiful old Prague rent scene is completely finished sorry to say.
My friend was there again last week (Mon to Wed) and said the bar/club was a waste of time. In fact he left to go to a straight bar up the road as it had more atmosphere in there.
I really can't speak or comment about weekends, as he is not around during those times.
Yes Apps work well out there, just like in any other Country.
If you mean up / down bar - nope, I didn't manage it / bother. I was there with both my 81 year old mother to show her the Christmas markets and after dropping her off at our apartment then on out with my not 81 year old BF. So, I figured having him sitting around up / down bar whilst I discussed the going rate with the locals didn't seem the best use of my time nor might it have been the smartest move and also mainly I just couldn't be bothered. I only slipped out for a few hours on the Saturday night with him so time was quite tight and when I noticed how quiet the place was I decided not to drive half way across the town checking anymore places out. This time I was there for a ( non sexy ) fun weekend so wasn't really that interested in what the rent scene was like there now - but hey if it's a mirror of the guys I seen in the gay bars and the dark rooms where I did go then you're welcome to them as they weren't my cup of tea in the slightest unfortunately and the gay "club" was like going back to some bad version of the 70's or something both fashion, dancing and gay behaviour wise .
The other rent bar (Escape) which is closed, was meant to be reopening, but that has fallen through apparently. They say meant to open next year now. I hold my breath?