Taster,
I think I can talk on behalf of 64 since I practically live there.
Pretty much each and every time I go there, management are folding or hanging out a load of towels, or their are towel racks down stairs or outside against the wall. There are towels everywhere, its like they breed the things. I have absolutely no doubt towels are washed after each use. What you might find is occasionally the towels have a 'musty' smell from being dried inside without ideal air circulation, that is pretty common in all brothels I've been in. If you get one of those, just ask for another.
I'm not sure what you mean by the 'shop is dirty'. The shop is small and the waiting areas aren't ideal, but I have never experienced the shop 'dirty'. There are several other shops nearby and I can assure you if there was any doubt about the cleanliness of this shop I would be the last one visiting here.
The shop is DA approved and I know from talking to Sophie that she abides by all rules and regulations in regards to its operations including OHS requirements. From my own STD testing the local STD clinic nurse has stated to me they regularly visit the local establishments.
Of course, if you are a family man (and even if you are not) you should use a condom every time you visit for oral and penetrative sex to be on the safe side.
If you are THAT shit scared of catching anything, then I would suggest you stick to Korean massage, just to be sure.
Enjoy!