Campingplatz Nord-West

This place is a bit older, but you have a really friendly service and a great location to getting to Dachau and into the city via public transport. There are two bus stops one around the corner to catch the 710 to Dachau and the other bus stop, the 175, to go to Munich is right in front of the campground! Or you can walk the 15 minutes to the bahnhoff from the campground to catch the S1 into Munich.
I really must express how pleasant and helpful the staff was, they really wanted to accommodate. There is a restaurant/​bar on site for breakfast and dinner and a nightcap. There is a dumping station, cooking area, showers and a beer machine!
They also supply wifi for a small fee, at first it was good, but after the first day it crapped out for about 8 hours. Seriously a good choice for reasonable accommodation during Oktoberfest!