Regarding your stay in the our accomodation, there are no additional costs. However, the only additional cost is local registration tax.
All visitors to Montenegro should register their stay and pay a daily tourist tax. This needs to be done within 24 hours of your arrival.
Host will do the registration on your behalf.
The tax costs 1 eur per day for adults and 0.50 eur per day for children aged 12-18 years. For children under 12 it is free but they still have to register.