Listed my home today in a MCOL Midwest city, got an offer for 30K above asking before anyone has gotten a showing

So I recently listed a home a bit lower than what I thought was fair market value at $219,900. The pictures were admittedly really good (proud of myself), and I had 20 showings scheduled in the first 10 hours. My agent tells me this is really good.

The weird thing is, however, that someone offered $250,000 with a private inspection clause the day I listed it before anyone has been shown the house. How seriously should I take this offer?