Despina was a wonderful host and attentive to our needs. The island has one taxi (Rousetto's) and she arranged for them to pick us up from the port and drive us the short distance to the suite.
The suite is a studio and is appointed with all the necessities (enough kitchenware to cook simple meals and a kitchen table, a double bed, bathroom, wardrobe, a/c). It was very clean. The best part of the space was outside in the covered area. The suite is on Despina's property (i.e., she lives next door) so when you sit outside you have access to her beautiful garden. If you like plants or beautiful landscaping you will enjoy relaxing at the table and taking in all the gorgeous plant life.
Koufonisia is very small. The main village (which is essentially just one road/walking alley) is just a few minutes walk away. If you head the other direction you will have access to beautiful beaches within 15-20 minutes.
The only issue we had was with wifi, as the signal was very weak and dropped frequently. We mentioned it to Despina who was also having a problem with it and trying to get it fixed. She went above and beyond and got us the password for a nearby hotel, as we occasionally got their signal. It wasn't much better, but we appreciated the effort and because it seemed like a one-off situation that should not affect her overall rating. The wifi was strong at the restaurants and taverns on the island, if you really need to access the internet.
Note: Despina's place does not have an address, so make sure you arrange a pick up with her, otherwise it will be difficult to find. It is within walking distance of the port, but you might not want to haul your luggage up the hill in that heat!