Pros (+) The apartments are in a great location, in a quiet street very close to ferries, buses, airport bus, metro, shops, bars and restaurants. Kadikoy is a great part of Istanbul to stay.
Cons (-) We stayed 6 nights, but our apartment was not serviced at all. No cleaning, no change of linen. The walls are very thin, we could hear everything from the apartment next door, especially the bathroom. The bed was not King size, my partner is tall, and was very uncomfortable. No bedside tables. Some staff were helpful, some were not.