Captain Burnham and the U.S.S. Discovery are sent to retrieve a mysterious 800-year-old Romulan vessel; until the artifact hidden inside is stolen, leading to an epic chase. Meanwhile, Saru is offered the position of a lifetime, and Tilly’s efforts to help pull her into a tangled web of secrecy.
I just realized that an 800 year-old Romulan vessel would place its origin in the 2390s...
Trek Central has also provided a picture of what is probably the Romulan ship described in the synopsis.
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Also, TrekCore has compiled some shots of what appears to the be interior:
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I just finished the series yesterday. Season one and two are weak as fuck and don't feel like star trek at all. Its ok as a random explode-y sci-fi show though. Seasons 3-4 really did feel like star trek and I liked them quite a bit. One of the best parts of the show is all the main characters have a lot of growth through out the show and its done in great realistic way. The ending of season 4 was awesome and up there with some of the best trek episodes.