Overall Grigoris' place was great. It is spacious, location very convenient (just 2 minutes from Monastraki station) and the view cannot be beat. As it is located on a busy street, it could be a little noisy if you are a light sleeper. We had our white noise app on overnight.
On our last night, main central heat stopped working but thankfully there was a backup heater unit in the bedroom which was helpful. Water heater wasn't working well and water would get cold after 4-5 minutes of usage even after we had turned on the unit on for 20 min as instructed.
Grigoris' unit is good but there is room for improvement in functionality.