u/Sad_Interview_7550

I'm a landlord who has recently acquired another property in the UK. Gas, electrics etc are all good to go. But the rest of the property needs decorating. I'm going the put new carpets down, paint the skirting boards etc. However the walls are a mess. They either need skimming, wallpapering, etc. What's the cheapest and easiest method to get them looking OK. I'm tempted to put lining paper up in the whole house and just paint it. What is the most cost efficient way of making it look OK?