Do you have a pic? It sounds great mixed with the stone, is this on all walls? Maybe try a stone rug with a little of the burgundy in a pattern to lighten the floor. What colour are the curtains?

Hi. What kind of styles do you like or are you wanting a sea/beach decor? Do you have any pictures of the apartment? It might be an idea to start looking through houzz or interior magazines and create an Ideabook of the styles you like. Do you know which way the rooms face in terms of light for decor?

Can is see some photos of black but floors.

​Hear are some thoughts- I see there are cases on the wardrobe. make use of them for storage- put items such as linen, extra pillows and off season clothes in them, or anything else that needs storing! A thought could be to place some stick on hooks onto the side of the wardrobe to take towels, and seasonal jackets, to keep items being thrown over desk chair or draws. If you can find them in black then the hooks won't look so temporary and will tie into the suggestions below. A perfect place for a framed map would be over the bed,  either a single large one or multiple smaller frames. Frames could be wood or a simple black frame. You can use stick on hooks these days to avoid wall damage. Taller bedside lamps, i know there are the sconces but they seem a bit high to be useful as bedsides. You could go with a dark anglepoise style - a little industrial to tie in with the metal beam. Bedding - invest in a more appropriate size doona. If the bed is a double, you could go queen or even king size for the doona to drape well down the sides and properly cover the bed. If nothing else this will shift the feeling from a student room! Doona cover - a simple one colour  but textured cover would keep the scheme simple - cotton is the flavor of the moment. A dark charcoal, darker silver gray?  My male other half can never see the point of additional pillows but I'm sorry, a couple of dress pillows does help to fill out a bed, even though they are moved for sleeping! And a bedhead. You can buy a simple one without buying a full bed frame. It looks like you have additional space on one side - the left as you face the bed head wall. If possible i would see if the chest of draws fit in this space to free up the other side from clutter. If it doesn't fit it  might worth  considering a taller, narrower set - if so, look for the same wood color and style. Alternatively the desk might work in that position, and the drawers could move to the desk location. Actually, the more I think on it , the desk there would keep the desk area from feeling tucked into the corner. Keep the drawer top clear of things- a leather box on top can be the go to place for things like phone, wallet, watch etc. And keep tidy!