Teos flat was very clean, comfortable, secure and furnished like the cherished home of a music lover, which it evidently was or still is. The team that manages it for the owner as an AirBnB accommodation was responsive and accommodating, solving little problems like my rather late check-in (owing to a major flight delay) and the lack of a bottle opener courteously and promptly.
For some reason I found none of the supply of pots, pans and cooking equipment suggested by the kitchen photos, and the kitchen supplies were extremely basic. As a single occupant who preferred to take advantage of the abundance of reasonable and good restaurants and take out options, and take meals with friends in the neighborhood I wasn't bothered.
It was a great place to spend time reading, writing and thinking. The internet was good and I especially enjoyed the large balcony. I would highly recommend it for short or long stays, and when I next travel to Athens I would be quite happy staying there again.