The location information of the hotel is sometimes listed in the Info section of the hotel description. This can identify the distance from the hotel to certain landmarks or the airport. Many hotels offer free breakfast. Often this is a continental breakfast or sometimes just coffee and donuts. This should be listed in the Info section of the hotel description.
Many rental agencies offer car accessories such as child seats, ski racks, tape players, etc.
Yes, however, modifications may cause rate changes. Car rates can change daily, even hourly, so changes you make to your reservation after confirmation can affect the original rate. No, taxes and insurance are not included. Many rental agencies offer shuttle service. You will need to ask about this at the pickup desk.