Good to get an on the ground update. 
I'm usually a frequent visitor but haven't been during pandemic.
'Dodgy madams' ... the only characters soliciting that I would consider dodgy are the ones I've come across (mostly Chinese-looking) are the ones along Socratous (parallel to the main street from Omonia to Metaxourgio, north side). That's why I was specific.
Madams connected to the white lights I've found invariably pleasant and never the least dodgy. The areas are also pretty safe at night, contrary to some people's thoughts.
Have you visited the white lights or studios during lockdown? Any changes? Are people wearing masks in the waiting rooms? Thanks again for your info. 
Ah yes I see what you mean now. Have only dealt with the Greek madams myself and like you say they're pleasant and the areas themselves are safe, despite looking run down and dodgy. Fair few druggies around but they don't bother anyone.
Im 15-20 mins away in Faliro so too much of a risk for me to venture down during lockdown. I visited the white lights a day before Greece went into full lockdown (the original plan was for only bars, restaurants, clubs and brothels to shut till a sudden spike in cases). Thats when I spoke to a madam who let me through and let me know they'll be working in secret.
Even before lockdown was announced, everyone is wearing masks in the waiting rooms. Some girls even give you a squirt of hand gel before getting to work. Service itself hasn't changed- girls don't seem worried at all, despite rumours on Bourdela during the last lockdown that only certain positions would be allowed.
Rumblings of lockdown extension after the 3 weeks are up... I sure hope not!