We spent 4 nights here with my 4 and 6 year old kids. Marianne's place is in the heart of the Old Town. Perfect place to explore the neighbourhood but if you expect a noise free, quiet flat I would not suggest you stay here. Marianne was understanding and responded very quickly when we needed her help.
As stated in the description check-in is at 16:00. This meant that the codes for the flat were not sent to us until 15:45. She did communicate that the codes will be sent on the day but this is something to prepare if you are anxious about how you get in.
We really enjoyed our stay here and we would definitely come back in the future.