Hotel 6400 is a three-star hotel on the outskirts of Sønderborg close to woodland and the beach, but only around 1½ km from Sønderborg’s lively city centre. Hotel 6400 is minimalist in all respects – even the name has been reduced to the city’s postcode. The hotel has 48 modern double rooms in three different categories: Double, Comfort and Comfort Plus. Each room has its own bathroom & toilet, wi-fi and TV. The Comfort and Comfort Plus rooms are particularly plush, with some also offering access to a west-facing patio.