Sifi, and Throubie open all the year round only closing for a week or so for re-decorating but both open at the moment, the souvlaki restaurant on the main road is open most days, I think Mouses will open in a month and Merastri at Selia was opening Fri, Sat and Sunday not sure if they are still doing that and Taverna Mariou at Mariou is open all of the time, Stells at Lefkogeia is always open day and night, so plenty to choose from some of the smaller places have a limited "winter menu" .
Oscraco`s and the coffee shop up from Tasomanolis are open all day.
Its a great time of year to come but the town is a bit of a mess at the moment with all the pipe laying works going on, where were you planning on staying ?