Startup Idea : Exchange Goods mobile app

An idea of mobile app basically from the trading system at the old time (system barter). People can use this application to post up the goods they dont need it anymore but is a waste to throw it , hence owner can post the item up to this application and people who interest want to take it have to take something out to exchange with it . At the same time , some coffee shops location will listed inside the app for people when they meet up to exchange the goods and found out they have the same hobby/interest/job and etc can have a chill session to discuss about things they themselve is doing rn . I need opinion from the public about this idea . ThANKS !!!