Marco, perhaps I can help.
I race Ironman Triathlon, and I bought my Alfa with my heart not my head. Despite having a Ti (means I get folding rear seats) carrying a bike about is a real pain. At the time I figured I didn't like the look of SW, and at around a 1200 pound premium over the saloon I figured I'd buy a roof rack and be done with it. Admittedly, I never bought the roof rack because it looked like more faff to fit than getting my bike in.
I'm 6'2, and ride a 56 road bike. If I'm off for a race weekend and need to take camping stuff, I'll remove both wheels and fit the frame behind the front seats (this means moving both seats forward, inserting frame then carefully sliding each back again. This leaves me with plenty of room for camping stuff + the rest of my tri kit, but the car is absolutely packed to the gunnels with very little room for passenger luggage. You can forget taking more than one bike inside the car too.
If I'm just heading to a race, I'll drop the seats, still remove both wheels and slide the frame in the boot, however with my frame + tri bars, it is literally a case of millimeters to spare.
Also, beware that the front of the 159 (and sides of a Ti) are very low, and I've had issues getting into/out of fields when camping. Granted, getting the SW version won't help this, but at least it's more practical!
Just my honest opinion from a practicality perspective. Of course the car has so much more to offer than this, and although its been fun to own and drive, It's not at all practical, and I can't wait to chop my 159 in for something like an SQ5 later this year.
Hope that helps