Two-sided marketplace alternatives (Airbnb, Fiverr, ebay, etc.)

Using Memberstack 2.0? There is an updated version of this article here.

Can I build a website where some users are able to sell and other users are able to buy/subscribe?

It's not possible to build a 2-sided marketplace with Memberstack. Here are a few alternatives you might try:

Sharetribe
Bubble
Zeroqode