My wife and I completed a one-month stay here and we highly recommend it if you are visiting Athens.
The location in Kolonaki is really good, easy to walk directly to the city centre and see the sights.
The kitchen is set up with all the amenities you might require, including an awesome welcome basket with coffee, teas, and much more!
The wifi is really fast, suitable for people working remotely, we never had an issue.
Do note that this apartment is on the ground floor, and as such it can be a bit noisy at times with the traffic and rubbish collection in the night.