Looking for bigger appartment

We are a couple who live in a room in one room but we need more space and to be closer to the hbf because I work until 02:00 and I have no trains so I sleep on work...We are looking for two room apartman with balcony (terrace) near the central station of Karlsruhe. Our current apartment is on third floor, is bright, beautiful, one room with kitchen, terrace and basemant. The neighbourhood is good for evening walks, have a loot of green areas.