Including my father-in-law we have six Seats in the family and have had two Leon Estates.
Yes, the estate takes a full-sized spare. The hatch does not. Seat do not supply a jack kit for the chassis but Skoda do. The part number is: 5E0093860 Other kits will work but this one has a better jack and more space for other items.
Best engine is the 150 hp 1.4 Act. Smooth, very wide power band, quick when you want it to be but delivers close to 50mpg on mixed driving. Lovely engine.
1.0 three-cylinder is a nice engine which is much smoother and more powerful than you'd think but too small for the Leon estate. 1.6 TDI is also too gutless although if you don't drive fast it's ok and you'll struggle to get less than 54mpg, nearly 60 on a run. 2.0TDI drops that to about 54mpg at best but although it is more powerful, the power band is so narrow it just isn't a lot of fun. 1.5TSI issues are exaggerated I think but the 1.4 is slightly better anyway.
Best trim is SE Technology. SE trim is a big step up over S but FR doesn't add that much over SE. Most cars have the tech-pack, don't even consider one without it.
Best wheel size is 17''. 18'' is too crashy on potholes and 17'' offers a worthwhile tightening of the handling over 16''. FR suspension does offer sharper handling over the S/SE but the softer set-up is the best compromise, especially is a lot of town driving is involved. FR on 18'' is not terrible but more tiring.
Pre-facelift is better than the facelift. Nothing of substance is changed, it's largely cosmetic and cost cutting . Headlights are slightly better, that's it. Bigger touchscreen is a con as the infotainment system is exactly the same, you just lose the very useful direct access buttons while the slightly bigger screen makes no difference. Everything else is the same or worse.
I'm sure your son will enjoy the Leon estate, they are great cars. Much better than an Astra, better than an Insignia in fact. Also much better than the
Ibiza, either the old or the current one. Pretty much as good as a Golf but cheaper.