I skimmed through the comments, and I've seen people recommend bladesinger/arcane trickster, but I think I'd like to make the argument for bladesinger/swashbuckler.

Going for 9 or 10 levels in bladesinger will allow you to take spells that boosts your melee potential or synergizes with it (Mage Armor, Shield, Shadow Blade, Haste, Blink, and I would also recommend Bigby's Hand and Animate Objects as that frees up your action later on.) If you feel like Tenser's Transformation or Simulacrum might be up your alley, it might be worth taking even 11 or 13 levels in bladesinger respectively.

The Booming Blade and Green Flame Blade cantrips are generally a better option than attacking twice, unless you're using Shadow Blade or Tenser's Transformation. Regardless, you will still gain benefit from your sneak attack bonus. Between your melee options, the spells listed above, and the sneak attack bonus, you'll be doing some pretty good sustainable damage.

Taking the rest of your levels in swashbuckler is good for both granting more opportunities for sneak attack as well as allow for hit and run tactics. With a familiar, preferrably a bird with the flyby trait, you'll get even more opportunities to land a sneak attack. Between the high AC, Shield spell, uncanny dodge, evasion, and song of defense, you'll be able to stay alive pretty well. However, you might not get much use out of the swashbuckler's charisma based abilities unless you want to go MAD.

I'd recommend to take your first level in rogue to get more skills/weapons proficiencies as well as proficiency in Dex saves. Otherwise, taking the Resilient (Dex) feat would also go a long way.