We've been here three weeks.. and it does take some getting used to with your stroller. I use a Maclaren Quest as well because it is light-weight and easy to 'pull' up and down stairs... and it seems to take the beating. Most MTR's have disabled lifts, but there still might be stairs to get to them. Places like the zoo are stroller friendly though (very nice surprise).. it's just a matter of discovering the route with ramps. People are friendly, and several have assisted me when I've been stuck in an MTR station with just stairs.. (although I suspect they are the Hk'ers who have lived/studied overseas). It is true however that you get the rude ones who quickly press the close door button on you while walking to the lift, or are able bodied but fill the lift so you have to wait... (although I also had my fair share of those in Sydney as well).
Taxi's can be a blessing and a nightmare. My son sits on my lap while we use taxi's.. and as uncomfortable with that idea as I am... again, it is generally only short taxi rides so I am getting used to the idea. I haven't had any speeding issues yet, but I have had a taxi driver who wanted to drive through red lights all the time which I was quite upset with... also, make sure you know roughly where you are going as some taxi drivers will try to 'rip you off' by taking you on a much longer route. I have had 2 taxi drivers try that with me so far (I've been to HK several times before, so I know where we should and shouldn't be going with most places on HK Island).
We don't have a car yet. We are tossing up the idea... there seems to be quite a few carparks here which are reasonably priced (in Australian terms) which may make things like shopping easier. Second hand cars are relatively cheap depending what you are after from what we have seen. Obviously you pay more for your european brands.
Choosing the apartment is a hard decision because you have so many factors to base it on. For us, the kids were our #1 priority (while staying on Hong Kong Island), so we wanted good sized bedrooms for them, and some facilities either in our complex or close by. The apartment we've got has a playground for the kids in the complex and a swimming pool. A minibus out front leaves every 15 minutes for Causeway Bay... so we're hoping we won't have too many worries. We also set a strict budget on how much we wanted to pay in rent.. make sure your husband has a good agent to do the negotiating for you as they can definitely get the rental price down, or extras (such as a car parking space) included...
Coming from a house, apartments here were a culture shock. The size of bedrooms and general living space can be quite small. Maids rooms can also be a bit of a shock to realise how some landlords expect a maid to live... but you work out what you think is a reasonable compromise and you go with it.
We're also undecided on getting a full-time maid. We are going to get a part-time maid service until we make up our minds, although we do have a maids room in our apartment to give us the option of having one when we are ready.
Hong Kong is fun for the kids... there are lots of different things to do and see aside from the shopping. There are indoor playrooms, outdoor parks, the zoo is free, a trip on a ferry is cheap, trams are challenging (with a stroller), but my 17 month old son loves them as a fun thing to do and once you get used to the MTR and which places have stroller friendly access you can venture virtually anywhere on the network to explore. I've decided not to let the accessibility issues hold me back from going out and exploring, and as such, my maclaren is getting a bit of a hammering... but it is worth it.
Good luck!!