Fix item name
Fix some parameter names
Someone not staying for a night shouldn't pay for one
Drop student info, add room type and calculate the price before storing it in the db instead of trusting the user
Add code to verify if there are some rooms left
Fix prices to have bed in double room cheaper than in single room, and total slightly more than what we pay
Display nickname and country
Add total paid lunches and beds
Fix room type name
Update price when changing room type
Prevent overbooking