The apartment is on a small lane, the name of which no taxi driver is aware. I had to show them where to go on google maps. Maybe one should use the street number of the intersection between the lane and the larger road, and give them the name of the larger road when using a taxi.
It is NOT a short walk from the metro station. I think you need to take a taxi if you have luggage. It only cost 3 Euro. It goes by a non direct route because of the one way road system.
From the apartment to Piraeus docks was 10 Euro, so if you are leaving Athens by boat it is easier to go direct to the boat with a taxi, rather than taxi to metro, metro to port, taxi to ferry. The cruise ships and ferries are very spread out, so being taken direct to your ship is far easier.

Regards the apartment itself - excellent value for money, with a lift up to the apartment which saves sweating with luggage. All facilities are provided, apart from a washing machine. Wireless internet is good. Lounge is air-conditioned, but unfortunately not the bedroom, so this gets rather hot.
Dionysios is an absolutely excellent English speaking host - he and his bilingual wife live in the flat next door if you ever need him, and he runs his business from the downstairs levels.
We phoned him beforehand from the airport and he was available when we arrived. He gave us an excellent intro to Athens, and answered all our questions. He recommended a restaurant down the lane to the left - ?? Athina ?? - which was really good.
Beware the fact that all shops are closed on Sunday and you can only get stuff from the nearby 'supermarket' up till 8 pm Saturday.
Dion spoilt us by providing fruit, biscuits, tea, coffee and milk and beer on our arrival. This is convenient if you arrive in the evening.

Very satisfied with our visit.