I would go for a 3000 or 3500 studio type flat, that would be nothing but one room, kitchen and bathroom just to be alone and knowing that it's my house and I can do whatever I want to rather than being bothered by others.

One solution is to look for a close friend that you know and the two families are really in good terms and know each other well, looking for sharing as well, get both a new flat and share it.

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)