Surely you have a basis to start, as you would definately know what you like and don't like. Start collecting images either online on houzz or pinterest, but also from magazines, this will start to form a picture that you can start imagining rooms from. Kitchens and bathrooms have built in fixtures that being semi permanent will be the hardest thing to select. Again draw inspiration from images and don't fuss over what's the kitchen trend of 2015. That's a gimmick, the trends are driven by you! The consumer, and they change as th year progresses, the tip is to stay true to your own tastes while learning and taking on board new and innovative things of the moment. If your thinking about a space that you want neutral and modern, then natural tnes and textures in your materials is the way to go over colour choices. Natural finishes include raw materials and tones, like timber, stone, concrete, glass and steel. Then there are textural and tactile elements that either have a visual or actual texture, like fabrics, again natural fibres are on trend like linen and suedes. Patterns at the moment are either organic or geometric. Organic are natural soft forms that work well with natures colours like greens, reds and blues, while geometric patterns are most dramatic monochromatic or tonal. start with these ideas, and think about fads, what's in right now most trendy will fade away quickest, so unless it's really you, thi about longevity and good design.

Can you put a floor plan with dimensions? shower over bath is ok but it's still a compromise.

3300mm room length is just big enough to run everything all along one wall. I would make bath either built into a hob or choose a freestanding design that is 'back to wall' and as narrow as possible (max 800mm). Shower 800-900mm, toilet 900mm elbow space then vanity near door. I would suggest seeing if you can change the door to a cavity slider and shifting it towards the exterior wall so you can use the window-less wall for all your plumbing...That may not be possible depending on whether the cupboard? in the rumpus can go. You would also want good sound insulation between the bathroom and the adjoining bedroom.

For storage, I used a mirrored lift up cupboard door above the sink area in my very small ensuite with some success. We put power points inside the cupboard too - it was a very good place to have them as the door lifts up & is out of the way. I also used some of the wall space to allow slightly deeper shelves, without the cupboard jutting so far into the room. The cistern was recessed into the wall cavity, (in our case below the window) & it worked well to save a little space in the room. Photos are not very good, but I hope you can get the idea.. It worked very well. The ensuite was 1mx2m. We use vertical towel rails. They're really good & very compact, but do make sure the electrician installs them up the right way. They work on the heat rising principal & do not work well upside down as ours were installed!Hope this is helpful. Good luck.