My apartment is on the first floor but has a lot of light and a bright athmosphere. Its in the neighborhood Friedrichshain and close to two train stations (U+S Frankfurter Allee, U Samariterstraße). There are plenty of Supermarkets, Restaurants and Cafes in walking distance.
I have an extra mattress available if needed.
The Bathroom is newly renovated and the kitchen is well equipped. Dishwasher, Vitamix, plenty of spices to cook with, etc.