The best thing to do is ask your partner why they hate the kitchen. You might find that it is something small or trivial, or they could it is hard to use. Whatever the reason, though, you should find that your partner will be receptive to giving you ideas about what could be changed.
It might be a DIY job, or you might need to hire specialists in fitted kitchens in Edinburgh. Regardless of their answer, you can work together to solve the issue. Even if you both need to save up a little to hire a fitted kitchen specialist, it is worth doing. The more that you can collaborate with one another, the better. The best thing that you can do, though, is to ask for their opinion and then act on it!