Nasos was a very accommodating host and provided me with all the required information ahead of time in clear and concise PDFs - places to visit, eat and supermarket information.
Nasos was also prompt in responding to queries. One thing to caveat is that if you are prone to being bitten by mosquitoes, you should ensure you have sufficient mosquito repellant (provided by Nasos). Only minor inconvenience is switching the boiler on for 30 minutes ahead of time and it's not ideal when trying to get an early start to the day.
All in all it was a good, comfortable stay in the heart of Athens.