Pitching in a report here: it's my 1st time properly visiting Taipei and this thread has been a helpful guide so far.
Soi13: the highlight - it's basically a wet dream for Asian twinks (the crowd is 80% twinks). It's funny how the crowd really does crest around 7-9pm, not earlier and not much after. The only place to be on Fridays and, especially on Saturdays. It's expensive for foreigners, yes, but it's worth it imho.
Hans: Not for me but it's not as bad as I initially thought - though I really only stayed for 1.5hrs. Different from Soi, this is clearly the "Asian uncle" sauna - there's even a large area for sleeping 😴 and a karaoke 🎤 room. The darkrooms are ... quite dark which means high reluctance for engagement (in contrast, at Soi - the darkrooms are quite active). The best part is this open area near the rooms that's kinda dimly lit. Some multi-somes end up starting here.
Also interesting that it's at the 8th floor of a shopping mall (so yeah, if you feel lost... Keep going, it's at the corner building)
Massages: I tried a few - will write a more detailed compilation later but after 4 massages from 3 different shops, it's clear that the HE is just a HJ, never a BJ. I got kissing 3 times out of 4 and was satisfied with my masseur's look 2 out of the 4 times (both from Prime Spa). The other two did not show their face in the website and while both weren't ugly per se , they just weren't what the mind expects. (Tip: just go with the guys with clear face pics. Or if going with the blurry/ no- face, despite what any reviews say, assume the worst)
And one guy (who's a porn star) offered to fuck me (he gives Top only vibes) for an additional 2k NTD - interestingly enough I didn't go for it as he seemed stiff and wasn't even hard during the erotic part of the massage.