Just done ours!
American fridge/freezer or built in FF?
My architect advised against the AFF with built-in ice/water dispenser as apparently these often break quite soon into the life of the appliance. When I started researching them, I found that the freezer part of the appliance is often much smaller than the fridge (especially if you have the ice-maker inside, which takes up a lot of the volume). So I sent for separate appliances - side-by-side, matching fridge and freezer, each 60cm wide. Means I have acres of space in both
Hot water tap - good or a useless gadget?
I have a Quooker - so far I love it! Not only makes making coffee quick, or boiling water for cooking veg/pasta etc, it also means I don't have to have a kettle on the worktop
Range style oven vs eye level?
I looked at both, but ultimately realised that having two ovens stacked, at eye level, meant I ended up with much more drawer space under the hob. Also, someone pointed out to me that eye level is much easier to put stuff in/take stuff out without having to bend down - something to consider as you're getting older!
Any other ‘gadgets’?
Wine cooler and underfloor heating
Worktop/stone advice
I went for quartz in the end. My units are dark blue, so adding a white quartz worktop (with sparkly bits in it) helped to lift the colour/light and stop it being too dark.
Flooring type
We went for engineered wood, which is lovely and warm with the underfloor heating