We stayed at Lena's apartment for 6 nights over the Christmas holiday. The apartment was very clean and tidy, just like the description. Lena's furniture is quirky and vintage and gave the apartment a cool character that we loved! The heating and hot water worked very well and very quickly. The neighborhood is quite cool as well, with a quick walk to some good cafe's and a particularly cool breakfast spot called Suicide Sues (we recommend!). Also, you are a 3 minute walk from the U-bahn that will get you to Alexanderplatz in 5 minutes. Very well connected. The only room for improvement was that the bed was on the floor, which wasn't the most comfortable. Off the floor in a frame would make the stay perfect!