We absolutely loved our stay at Katarina's place and couldn't recommend it highly enough. It is in a brilliant location, centrally located to walk to all central berlin's sites. The apartment itself is very large and very bright with plenty of space to store your things. The apartment is accessible by lift and there are no steps to get into the building making it perfect for prams, luggage etc. Agree re curtains not keeping out the light but I enjoyed waking up with the sun. The apartment agent within the building made the check in and check out process seamless. Wonderful experience!