thinking about booking a week in jan ,what will weather be like would we be sunbathing during the day .also nightlife will the bars markets ect be open
Most things will be open in winter.
As to weather your guess is as good as anyone's. I have been there at that time when is was short sleeve weather every day ,and other trips where it was freezing every day with many places pipes freezing. Needing many blankets to sleep as many places have no heating .