Wooden windows - pain to maintain and cold. Previously loved the period ones - but after living in two period rentals, the love went out the window.
Fisher & Paykel dish drawers - look great, but never work properly - excellent customer service and warranty. Has been rebuilt a number of times.
Conservatory - we put a warm roof on it and much better.
Private roads run by residents - I'm losing the will to live with mine, give me a normal road any day.
Developers moving next door under the guise of "hi I'm your friendly new neighbour" - no your not, I'm not stupid.
Underfloor heating - temperamental, give me normal rads even if it means losing wall space.
Corner houses / plots - magnets for dog poop bags, people having their lunch and chucking it in your garden, fly tippers. Random's sleeping outside.
Agree with OP - extra floors, so basements and third floors.
Don't buy near schools, hospitals or dog walking spots.
If rural try not to buy houses with off grid oil central heating.