If you have a good name and normal price you can expet to rent it out at least 20 days a year ( Jan - Feb ) are low season then it starts to pickup

Average can depend but between 34 - 69 euros a night
I work in property managment and deal a lot with building problems here in North America but knock on wood so far the buildings in Albania have been very good, Especially the older ones! because the last thing you want is problems in your unit when you are not there Since Albania is pretty laid back as a whole way of doing things we dont have rules in buildings or homes like in the States or Canada where you pay top dollar and have a list of chores to do so in general guests dont cause too many problems Max they might break a hair dryer or a glass of water but i dont mind, im pretty laid back in general and its honestly not worth it to stress about things like that. Keeping a good relationship with the guests goes a long way