We spent a week doing a freshen up on most rooms and doing a deep clean. We painted our olive green kitchen to a neutral tone, re-papered a very intricate wallpaper to a neutral again.
We gave the gardens a tidy and popped some fresh flowers around the house.
Bought some new throws, cushions and some staging pieces ( a glass biscuit jar with nice biscuits in, nice fruit bowl with fresh, bright fruit in)
A good clean everywhere....doors, windows, skirting.
De clutter
Move furniture if necessary to make rooms look bigger.
Lights on, fresh bedding, heating on and a few windows open when people view the house.
We did this after our house being on the market for 2 weeks without much interest. We asked the estate agent to remove the pictures from online and we wouldn't be doing any viewings for a week while we got the bits done.
We got it all done on a budget (thanks to discount stores - around £200) . When the house went back online we had 3 offers in 5 days and so it sold.
We originally thought it didn't matter too much as buyers will put their own mark on it but at the very least I think you should clean and de clutter.
Look at similar houses to yours on right move and see what else is available for buyers in the same price bracket as your house, that is what the buyers will be doing-comparing houses.