Stay with Thuy is simply awesome, the room is very spcious even after a queen bed, wardrobe, working table, mini fridge, etc is inside. 9th floor, but with lift.. no worries for heavy luggages.
We also get to used the kitchen for some wurst cookin, utensils are there ready, just clean and wash it after using it. Bathroom water pressure is strong enough too!
Not very downtown area, but the U-Bahn (tram) is very accessible from her house. There are 2 nearby stations you could access, 5 - 10min walk. There's also grocery shop nearby you can get your needs :)
We definitely recommend her stay in Berlin👌