Prefered Stages

Smashville

Final Destination

Small Battlefield

Unfavored Stages

Town and City

Kalos

Yoshi's Island

Don't jump above him and expect not to get shoryu'd, they always shoryu
Out space
When they start playing safe and stay near ledge, be careful with your moves, if you whiff once they'll start down-tilting you and doing those SF combos which get you to 999% and then shoryu you
Don't stay in shield too long, Ryu has a shieldbreaker move and Ken has a shieldbreaker combo
If they don't know their SF combos, it's a free game
Gimp them
Learn the player's pattern when Ken/Ryu is in the air, they can use their focus to take a hit and go left or right, so keep that in mind
Parry Hadouken, jumping also works (keep in mind point 2) but parry gives style points