DON'T skimp on the bathroom and don't use any colour scheme except classic white. Stick to neutral colours - less is more. Don't have stone cladding. It is expensive and will put off buyers. Don't attempt any jobs yourself unless you are a DIY whizzkid.
Bodged jobs are a big turn-off to prospective buyers.
Don't have double glazing if you have an old home. As a general rule it is best not to double glaze any house built before the turn of the century. Don't spend vast amounts of money on carpets and curtains. People's tastes are different. Don't put in a swimming pool.