When did you stay at the hotel in Sochi with your friends?
Where did you stay in Sochi with your friends last year?
What
With whom did you stay at the hotel in Sochi last year?
Who stayed at the hotel in Sochi with friends last year?
Мне кажется, со словом what можно составить вопрос, но ответа в твоём предложениии не будет