General Strategy:
I personaly enjoy this matchup, it feels fairly even givin both character's low health. Akuma has stronger attacks, but Sakura makes up for it in damaging combos & stun.
If your opponent is the runnaway type, don't fret! This is a good situation for Sakura, play his game and keep your distance, avoiding as much damage as possible, while tossing a few of your own fireballs. Eventually they always come in for a small combo to attempt to build a life lead, this is what you'd been waiting for. All you need is for 1 mistake, and suddenly he HAS to come to you or avoid losing to his own strategy.
If your opponent is playing a rushdown type, this matchup becomes less in your favor. Akuma's S.Hk can pressure you into making stupid mistakes, as well as his demon flip mixups. Here you need to hold a strong defense, and capatilize as big as you can on every chance you get. FA's can be easily shot down by this type of player, so use them sparringly.
Against any type of Akuma player, you really only need 3 or 4 good combos to put him away.