Ningsih,
We live in Happy Valley which is about 10-15 minute walk to Causeway Bay. This area is very nice, not congestest and busy like Causeway Bay and Central, close to all amenties, good transport links (via Tram, Bus routes, closest MTR is Causeway Bay). There are many service apartments here and hotels doing special deals, you can try:
Ming's Court (
www.mingscourt.com) - service apartment
The Emperor Hotel - Tel 2961 3110 - advertising hotel rooms with all amenties included
or,if you really want Causeway Bay, I saw an advert for a place called Regents Height Tel 2895 2555 / 2407 6161
cheers
T