Hello,
Due to my careless, I didn't read the description very well. There is no elevator for the apartment and it definitely not possible to climb to 6th floor for who needs a knee medical treatment. The reservation is originally for 8 nights and not refundable. I have to reduce my stay to two nights. I requested the change on the same day when I booked it (basically in 30 minutes). It is possible to do so? Will the owner decline it? It's a not cheap booking, otherwise I will loose all the money.
Many thanks for your advice in advance!