The four-days/three-nights Inca Trail -trek was amazing. Most of all, the incredible mountains, landscape and Inca sights make the trip definitly worth it.
While the cooks created every day really nice meals - and even three-course menus - on over 3,500 meters above sea level, the porters made also an really nice job. They carried over 25-kilo-bags and were running with it uphill and downhill - only to build up our next lunch spot or camp sight.
The tents we slept in were originally four-person tents in which only two people slept. Therefore, we had more than enough space in these.
Overall, I definitly would recommend the four-day trip. Most of all due to the incredible views and Inca sights.