Konstantinos is a fantastic host, and the place was really cool, but we had a couple of minor issues.
The views of the Acropolis from the balconies (and the bed!) were really spectacular, and impossible to beat. The location is very central and well-connected, but also borders on feeling a bit touristy.
The kitchen area downstairs was a bit small, but it introduced the elegant minimal aesthetic of the place very well. I was pleased to find a carrying tray to bring up coffee and pastries to the top floor balcony the first morning. After bringing the dished down and washing them, though, I found that there were no dish towels or paper towels to dry them off with, so we had to use a hand towel. We mentioned this to Konstantinos when we checked out, and he was very receptive to the feedback, so you will probably have dish towels when you stay here.
We had also brainstormed going to a market and cooking in for one meal, but with only a single-burner hot plate, we decided to eat out for every meal instead (this was a better choice anyways, since it was my first time in Greece, and the local food is generally spectacular).
By morning, we had weathered the worst of the issues: the beds were very, very loud. Just rolling over created all sorts of creaks and squeaks, which kept us up a bit, and even woke us up a few times in the middle of the night.
When we mentioned this to Konstantinos, he was extremely responsive and very prompt in helping. He came over that evening to try to fix the beds (they're homemade). He succeeded in quieting them down enough for us to sleep better, but they still made some occasional noises.
The other issues we ran into were pretty small -- there were few towels, and no shower curtains, so we lost one to mopping up the floor after showering. Thankfully we didn't spill our morning coffees, or any other liquids that needed mopping up.
The floors also stayed cold, no matter how high we turned the heaters, or how long we left them on, making me wish I'd brought slippers (this probably only a wintertime issue).
The hair dryers in each of the bathrooms were a nice and welcome touch, and there were floor matts in front of the sinks, so we didn't have to use another towel for that :)
The recovered wooden jewelry workbenches also made for really nice decor.