Hi LBR,
Regarding water, things have no improved since Fiona's time. So, it happens regularly that you end up with really dark/brown water when showering, which is not pleasant... also, we ended up adding Panasonic water filters to the tap, so we have clean water to cook and rinse dishes. and you drink bottled water, like everywhere else in HK.
regarding noise, my real problem is more the elevators. they're very noisy, and quite disturbing starting at 5am everyday. however, this might be caused by being close to elevator shaft on top floor. still, watch out for that elevator noise if on other floor - might be similar...
regarding internet, the only provider is PCCW. no other choice. however, it's fiber, meaning the speed is amazing. we download a lot, and never had issues. we also watch tv in streaming, and same speed an quality. so, you might not have a choice, but the only one available is very good.
i hope this helped, let us know where you'll live in the end...
cheers,
F