Karsten's appartment is bigger than expected, really close to the metro (1 or 2 min walking) and to the principal monuments (5min by metro). The street is very calm and there is a supermarket and a few restaurants 5 min walking from the appartment: all the essentials are on the same street.
The flat is quite luminous and contains exactly what is shown on the photos. Moreover, it is clean and seems to be new.
Finally, Karsten is very communicative, explains everything very clearly.
Really good experience in the end!