Im renting my beautiful one room apartment with separated kitchen in Kastanienallee prenzlauer berg, for the 2 weeks in July(flexible dates and can rent for more than 2 weeks).
Everything is included in the rent and you basically just need your clothes and personal items.
The apartment is located in a great area, close to mauerpark and multiple bars and restaurants just under the building.
The apartment is pretty good connected with tram stations nearby (1 min away)