Having experienced so many Airbnb stays, I have to say that our stay at Elena's apartment was one of the best, if not the best experience so far. The apartment is brand new, tastefully furnished, full of natural light (floor to ceiling glass windows give you very luxurious feeling), and right across from Mauerpark. We have 2 small kids and a double stroller so wide doors & elevators made life very easy and convenient. Indoor parking is always a plus. There's also a plenty of on-street parking spaces around the building. The location is excellent as well - close to everywhere including great restaurants and coffee shops, plenty of designer boutiques. Very well connected in terms of public transport. We biked whenever possible and were able to store our bike in the indoor bike storage in the building.
Finally, Elena was an amazing host. She was always so prompt in replying to any of our concerns and needs. She was like a good fairy with a magic wand making things happen asap. Will definitely recommend her place and hers will be our first choice when we are in Berlin again.