Chop and small waves. Bigger waves with stronger winds or a few with the ferries. Shallow area for about 100m. Many stones in the water, don´t forget shoes.
A wetsuit is necessary nearly all over the year. The water is between 5-20°C (spring to summer), air temperature is in the average 18°C (in summer) and can go up to 30°C. If you have the adequate wetsuit you can surf from April to November. Off-season is possible but very cold.
From Hamburg on the A1 north. Then take the A20 towards Rostock. Exit to Schoenberg. Then take L01 to Dassau, Kaltenhof, Wilmstorf, Neuenhagen until you reach Kalkhorst. In the beginning of Kalkhorst turn left at `Am Sportplatz` then into `Neue Reihe` towards Gross Schwansee. At the end turn left and follow the road and find your way to the water. If you are on a very bumpy road made out of slabs you are on the correct way which will lead you to a parking lot close to the beach. Pack your gear and walk to the beach (about 200m).