Based on the reputation and reported issues with the 1.6 HDi in every car it is fitted to (at least in the UK), I'd shy away from it.
Commonly found in the Peugeot and Citroen range, but also rebadged as a tdci in the ford range too.
Common wisdom seems to be get the 2.0. HDi instead.
The C4 is a cool car, well styled though build quality could be a bit better. The Picasso (MPV version) is very practical, doubling as a van.
If you would not be confused by RHD, it may be worth a trip to the UK to buy one, and import it?
£795 / €920 / $1050
https://www.gumtree.com/p/cars-vans-...795/1334014308
Happy to help if you need a hand sourcing a UK car