Stay a night or two in an old-style sailing boat! There may not be a shower on board, and you can't expect modern standard, but cozyness level is high (possibly TOO cozy for someone over 185cm). You'll stay in central Gothenburg on the river's North bank (frequent FREE ferry to South). Simple pentry for cooking. Two gyms, one spa and one stadium with showers are close by. 1-2 sleep in the front & 1 can sleep on port-side in the salon, but with three it might get a little over-crowded.