Great place to stay and visit Berlin!
Kinga's apartment is a 1 bedroom, 1 bath that's centrally located in Mitte and just around the corner from Prenzlauer Berg. My partner and I stayed for about 9 days 8 nights, and couldn't have been happier with the stay.
The apartment is beautifully furnished, with a kitchen and other furnishing that appear to be mostly made by Kinga and her husband. Really impressive and beautiful industrial vibe throughout. The only concern we had prior was the comfort of the mattress from the photos, which turned out to be extremely comfortable! The photos are very accurate to the space (no magic work done on the photos, etc).
Within walking distance there are endless options for restaurants, bars, stores, public transportation options, bike rentals, vintage + resale stores, countless parks, markets, and much more. A few of my favorite places nearby include Engelberg (breakfast), Ice&Oak (ice cream + soup), Coccodrillo (Italian food), Lebensmittel (schnitzel & more), Prater Bier Garten (beer garden), Schokoladen (live music). We took the M5 to easily access to other neighborhoods of the city with ease. It might sound like I'm gassing up the place + location, but I'm not! It was really that nice. Kinga was also extremely communicative and accommodating as a host- thank you!
Would definitely recommend staying here, if it is within your budget.