I dislike exclamation points in narration, and most readers (and literary agents, acquisitions editors from publishing houses, and so forth) don’t like them, either. An exclamation point in narration is a blatant “telling” device, since it tells the reader, This sentence is exciting! Save the exclamation points for dialogue, and even there, use them sparingly.
Change Renaissance Age to the Renaissance. (If you don’t even know the correct name for it, you probably shouldn’t be writing about it.)
Because it is used as a compound adjective, and because leaving it as it is would make it somewhat unclear, hyphenate password-protected.
Get rid of the quotation marks around the network name.
Add a period to the end of the last sentence. (That one should be obvious, shouldn’t it?)
It worked. You traveled back in time to the Renaissance. Jokingly, you turn on your Wi-Fi, only to find a password-protected network named icniV aD.