I can recommend Baby Buddies in Sheung Wan. Not too far from Midlevels. My son started there at 1 year old and it is a good mix of free play, singing, story time, mat time and art & craft. They do a free trial class so google them and give them a try. The Baby Buddies class is for 1 - 2 year olds. They have a younger class and also a Step 2 class for 2 years - 3 years.
SB2