Sounds like you are going through a very similar experience to me only instead of a mk2 Golf, mine is a mk3 Polo GT. Whilst having to clear out years of cigarette ash, glass, beer cans, milkshake bottles and tidy up abuse from karakoe equipment both inside and on the roof of the car
(but what do you expect for £75)............I've been driving a 106 XS! Apart from the odd nice day when at least I have the cabrio I can take out. Polo has now passed its MOT and will become my daily driver from Thusday onwards. 106 will go back to my brother, who I borrowed it from whilst he served an 18 month ban.
TBH the Peugeot hasn't been that bad. Its nippy, economical and (so far) reliable. I've put 10,000 miles on it whilst I have borrowed it and my only major criticsm would be the build quality. As opposed to a Golf it seems under engineered, metal is too thin and bits fall off or break. I really can't see the bodywork and components standing the test of time as well as a VW..........but then I don't need to say that do I, I'm preaching to the converted