Welcome to the forum!
I follow a BMW expert mechanic on YouTube and also a retired racing drive/car reviewer who won a fair number of races and they both highly rate 118d as an entry level fun car that's so fun to drive around tracks. The 4 cylinder engine sitting right close to the centre of the car definitely helps to make it more fun.
I come from late 1990 - early 2000 Jap cars (Ek9, NA Mx-5, CL1, WRX, 350Z etc) so buying E87 130i was a bit of leap of faith but so far I'm loving how nice it is to drive. I thought mk5 GTI is a bit of step up from Japanese cars but this is another step up from VW.
I hope you enjoy your new car and let us know how it's like to drive before/after tune!