What are the small details that give a quality finish?

[roogi]

Morning,

We moved house about 6 months ago and a starting to look at what work needs doing to it. It was built in the 70s and the structure is all fine, but some of it is looking tired and there are a number of jobs which need doing to smarten it up, namely: -

New skirting on stairs and some rooms (there is still some original skirting)
New carpets
Lots of creaking on stairs and floorboards - repair and fix
Painting/decorating
New tiles and flooring in bathrooms
New window sills - almost all of them have had a plastic sill added over the original wooden ones

Just looking for tips and advice on what details to consider to get a "quality" finish on the house. This is probably similar to the recent kitchen and bathroom threads where mistakes and lessons learned would be useful.

[roogi]

Think this might be more work than I originally thought.

Door handles definitely need changing.

The gloss black kitchen will be a project for another time.

The house is lovely though