The front desk doesn't work around the clock: on weekdays: from 6:30 AM - 9:30 AM and 5:00 PM - 9:00 PM, on weekends: from 7:30 AM - 10:30 AM and 5:00 PM - 9:00 PM.
In case of late arrival, the hotel has a self-check-in machine, where guests should enter their reservation number.