I’ve had two 1.4tsi estates, a 2014 and a 2015. Absolutely awesome engine, both of mine had over 100,000 miles on when I sold them, still original turbos and clutch. Both were very reliable, I serviced them every 10,000 miles in my opinion these engines will easily do 200k miles.
Whilst I don’t see the timing belt and water pumps as being any kind of issue, both of mine needed new water pumps around 80,000 miles, they both started dripping coolant so I just noticed the level dropping slightly.
The water pump assembly cost about £250 from Skoda and I fitted them myself, they are driven off the gearbox end of the exhaust cam by their own little toothed belt.
I would add that I now have a 1.5tsi act Superb and find that to be a great engine too.
All the best in your search.