Camden Town is full with second hand shops and music shops. It's one of London more 'alternative' neighbourhoods and definitely worth a visit. Also visit the Camden Market for great finds. If you get hungry I can recommend Honest Burger. Nearest underground station is Camden Town.
Shoreditch is definitely a hipster place. You can expect 100% locals, no tourists. It's also a great place for street food: Boxpark, Pump Street Foodmarket or Dinerama to name a few places. There is no underground to Shoreditch but you can go there by Overground. Get off at Shoreditch High Street or Old Street.
Some spots I can recommend:
The Breakfast Club - Legendary breakfast spot - 2-4 Rufus St
Ozone Coffee Roasters - Very good coffee and food - 11 Leonard St
Grind - One of my fav's in London - 213 Old St
Albion - Good for any time during the day - 2-4 Boundary St
Pizza East - Great pizzas- 56A Shoreditch High St
Honest Burgers - 6 Baldwin St
Dishoom - Indian cuisine - 7 Boundary St