If you are having trouble parking or accessing the home, we recommend making best efforts to access the home, and sending the client regular polite updates about what is going on so it's clear. The worst thing to happen generally is if the client would later dispute the job and say that you cancelled if in fact you tried hard to get into the home and could not.
Here is a format we have seen professionals use successfully so clients have trouble disputing things:
You can always do what you like, this is just something we have gotten good feedback on from other pros.
If you finish the tasks on the Client's To-Do list with time remaining in the service, use your best judgment on how to make the Client happy. Clients generally expect that Pros stay and do their best for the full job time.
Most clients do not believe you can "finish" a job in the shorter times booked through TIDY. For example, those in the Army have noted that they would spend 12 hours on 1 room to get it clean. If you leave early, and the client complains, you may have a large penalty, so leaving early carries risk. Ultimately, it is up to you, but we recommend being aware of the risks.
Every Home and Cleaning is unique. Some To-Do lists may be too long or some tasks may take longer than expected. Clients generally expect you work for the full duration of the Cleaning, but you may not get some tasks on the to-do list. Make sure you mark the tasks you were not able to complete on the Cleaning Certificate. That will make sure it appears on the to-do list on your next visit.
At the end of the day, these are your clients! You control the manner and means by which the work is performed.