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Bristan Contemporary Shower Kit 100
Go deep with the bathtub not long
Depending on how small your bathroom is you might want to design in a bathtub that takes up less floor space. If you go that way make sure that you get a bathtub that has some depth. That way you can still have a relaxing soak even if you can't stretch out in it.
Steer clear of corner bathtubs because they are likely to take up more room rather than less.
A toilet shelf
The wall behind the toilet is often unused space so it's the perfect place to put a shelf or a cupboard. This should help with the storage space problem.
Sliding doors
A door that opens into the room will deprive you of some floor space because you have to have room to open the door fully. Using a sliding door can solve this problem. Doors can slide against the wall or better still, inside a cavity wall, which will recover all the space lost to the door opening.
I was unable to use this approach in my small bathroom remodeling because I didn't have a suitable wall but I did look into it.
Curved quadrant shower enclosures
In any small bathroom design shower arrangements must be thought about very carefully. If you are including a shower cubicle then consider a curved quadrant design. These cubicles are flat on 2 sides with a curve to complete the enclosure. They save a lot of useful space in the rest of the bathroom because they eliminate the fourth corner of the enclosure, which often gets in the way. A curved quadrant shower cubicle worked well in my small bathroom design.