Excellent beginning. You've given us a real good sense of your protagonist in a short and concise way. A Romulan in Starfleet is a tough sell but Sran's history is both believable and compelling.
Also enjoyed how you've managed to weave plenty of canonical history in here, from the Romulan war, Captain Keel and the Horatio
to the Enterprise-C
Perhaps the only thing stretching believability here was the fact that Sren got to name his own ship or the round about way he settled on the name.
Regardless, looking forward to more.