We had a very nice 3 day stay - the location was great within walking distance of all the main sights and the ferries / buses. There was lots of space in the apartment and it was very well equipped. Maria helped us drop our luggage early, which was kind - generally the check in/out was extremely smooth.
The apartment is below street level and we expected it to be a bit dark, but actually there was natural light from light wells at the front and back. We were there in winter and there were two dehumidifier units in the apartment that needed to be running, but with them operating, we had no issues with damp that some of the older reviews mention -we also did a load of washing and our clothes dried fine.
Generally a great stay in a very nice apartment with lots of character. We'd certainly recommend it.