Great little place, with a very communicative and responsible host. Frau Engler, who lives locally and manages the unit for Liz, was a big help as well.
A few tidbits:
The apartment doesn't some of the usual stuff one expects to find in an AirBnB (detergent, sugar, seasonings, cooking oil).
The shower stall is very small and the water tends to oscillate unpredictably between too hot and too cold, settling at "just right" for only a few seconds of every minute.
Be sure you're prepared for Liz's "extras"--200 Euro deposit, 15 Euro/week heating, and even 10 Euro for towels. Oh, and that gets you just three small/old/crusty towels. First time I've had to pay for basics like heating and linens at an AirBnB, but even with those extras, Liz's place is a great value.
Now to be clear, those are minor quibbles, and my stay at Liz's place was generally excellent. The apartment is nice, clean, and cozy, on a nice street in a nice building (with an elevator!), and it's an excellent value. Liz herself was wonderful to deal with, responding quickly and thoughtfully to all messages. Oh, and Moabit is a nice home base in Berlin.