GREAT host, good value, but a few things to be aware of:
This apartment is small but it was immaculately clean and well taken care of. The bed is comfortable and the amenities are good including a full-sized fridge and TV. The location is fantastic. It's an easy walking distance to everything in Koukaki including nice cafes, bars, restaurants, supermarkets, etc. The archaeological area of Athens is a stone's throw away too, so perfect for sightseeing.
I do need to mention for people like me who work online, the internet speed was not great and I ended up having to stand by the window to get a phone signal in order to tether to my phone for uploads.
Another drawback is that this is a street-level apartment in the entranceway and the window looks right onto the street from the bedroom. The main complex door slams shut which shakes the whole house and definitely woke me up a few times. The street noise starts in the early morning, even though it's not a busy street, and is very loud.
Additionally, the hot water boiler turned out to be broken when I arrived. The host didn't realise this but in a show of great hospitality drove all the way across town to try and fix it. When he couldn't fix it, he managed to get a new boiler purchased and installed that same evening! I was impressed and appreciative.
So in sum, the price is very appropriate, the host is fantastic (!!), the location is excellent but the internet was slow and the ground floor location makes it a good spot to spend a night or two but I don't think I would want to rent it long-term.