Beatrix's place is perfectly located for all that you'd need in Berlin, from the ease of arriving by bus 109 from Tegal airport, being dropped very close to the apartment, to then using the S-bahn, which is also very conveniently located. There are many restaurants, coffee stops, and grocery shops within easy walking distance, you'll want for nothing as everything you need is close enough by. I was staying to run the Berlin marathon so being able to cook and sleep well was essential as part of the build up; Beatrix made it all very easy, she allowed me plenty of space to cook and relax, and her apartment is a peaceful retreat, having it's own courtyard off the street all I could really hear is the fountain's running water in the courtyard! There's a separate guest toilet and coordinating the shower sharing was super easy. Staying with Beatrix ultimately made my stay in Berlin far richer than it would otherwise have been, from the conversations, piano playing, and seeing a slice of German life I'd never have seen staying in a hotel. I would love to stay again and would highly recommend staying with Beatrix, she's an amazing lady.