Julia and Lisa were both working, so we only met their mother. She was very friendly and gave us a lot of trip advices. It was a large apartment. The living room area, the kitchen area, the sleeping area, and the bathroom all are perfect. We had 9 people staying in this apartment and still had spaces to put our luggage, had our own beds, and we felt quite comfortable. The only problem was that it only has one bathroom. But Julia had confirmed with me ahead and we accepted.
The neighborhood where the apartment locates is very quiet. And it is very close to a public transport station. It's a good place to stay at in Munich.