Short of space ?
The biggest gripe about kitchens today is the lack of storage or worktop space. This can be avoided however through clever design and careful planning.

Many kitchen designers find that the easiest way to plan a kitchen is using the 'Kitchen Triangle'. Take the three most used elements i.e. the sink, cooking and fridge areas and place them in a triangle in your kitchen. This allows easy movement between the elements and helps you maximise relevant storage in between.

The 'Kitchen Triangle' is not always achievable i.e. in a Galley kitchen, however it provides a good starting point to help you with your design.