Ruth's place is phenomenal for 2-4 guests depending on how many people you want to put in each bed. The bed was comfy, the apartment was very clean, and neighborhood is very quiet and has great character.
Best of all: The UBahn (metro) is literally three doors down from Ruth's front door and supremely convenient. There are many shops, bars, restaurants, and grocery stores within walking distance.
You can also get pretty much anywhere on public transportation within 15-20 minutes.
My travel partner locked the keys in the apartment but Ruth was amazingly responsive and her husband came out to let us in at 9:30PM. They saved us from having a terrible time!
Highly recommend this place!