Host: Nikos was a very nice host, always available when needed and trying to help anytime we had an issue. Besides, he has a taxi company which I would recommend to use for instance to come from the Airport (metro connection from airport is expensive and not so comfortable with luggages).
Flat: flat is spacious, with 3 big bedrooms and a comfortable living room. 3rd floor with lift. You can either rent all the flat or just one of the rooms. Room disposition is a bit unusual (one of the room is accessible via the kitchen), but that is ok. Beds are supplied with blankets rather than quilts (which I would have preferred). If you need a washing machine and a dryer, I would recommend to arrange this with Nikos in advance as they are in principle not accessible to the guest. Heating via reverse air conditioning in all room except bathroom (without heating, but despites the cold winter it was ok) . Big flat tv screen with even netflix accessible. Wifi working perfectly well.
The kitchen is well equipped. There are reserve of coffee, cereals, sugar, oil, cleaning supply (including tablets for dishwasher). Even a caffé frappé machine!
The flat was extremely clean. A cleaning lady comes every wednesday. Check with Nikos her working time to ensure it matches your own planning.
Location: very convenient, close the crossing of Marni & 3 September, 300 meters to the archeological museum (great!) and 600 meter to Metro Omonia. Big advantage is supermaket just down the building. Omonia does not have a good reputation as a district, yet we stayed two weeks as a family with 3 children and had no problem whatsoever. Police and even anti-riot units (!) almost permanently stationed close to the Metro. Omonia station is very conveniently connected to the touristic places of interest (one stop away from Monastiraki and two stops from Syntagma). So, this was just perfect. Plus there are a lot of bakeries around.
Overall, the flat offers a good value for money. It is not at the heart of the touristic places, but very close to them by metro (one or two stops). The sleeping room are spacious, the flat is well equipped. Nikos is a very nice host. Supermarket down the building is really a plus. Flat is rented at a good price for what it has to offer. We spent nice christmas holidays there. Thank you Nikos!