On average, 5 times per week.
2) Alone or with other people? With who?
Sometimes alone, sometimes with wifey-to-be, sometimes with the lads.
3) What's the perfect temperature in a sauna for you?
At home, normally about 65 75. I prefer humidity to dry heat.
4) Vihta or Vasta? Which word do you prefer?
Neither. I exfoliate with rough gloves that has the word 'potatoes' written on them - athough I think you can buy them with the word 'sauna' written on them

5) What you usually drink in sauna or after it? Water? Beer?
Maybe a cold beer. Depends.
6) Your nationality & gender?
British - Male