Have you googled apartment size furniture? IIRC, Ethan Allen and Pottery Barn offered smaller scaled furniture.

Close, but still too big. Showing because I think you'll need sofas without arms for those dimensions.

https://www.cb2.com/slipcover-grey-modular-3-piece-sectional-sofa/s679325

Outdoor one would fit:

https://www.cb2.com/ebb-outdoor-sectional/s503468

Just to give you an idea of how that size sectional might look. IMO, it's an awkward look - I'd probably just do a sofa and a separate ottoman in front.

You can barely fit a loveseat in that space, definitely no room for a sectional. Here's a simple loveseat that fits. http://www.furniturelandsouth.com/shop-furniture/century-furniture-del-mar-loveseat-esn216-4

Pottery Barn... they have an apartment store with small sectionals.

Also, could you instead have a love seat or settee with an ottoman?

Ikea.