I left Paris about 2 hours ago. We were there for about 24 hours. Dd was there a day longer.
The rules on masks is getting a bit stricter from tomorrow where you then will have to wear them in all enclosed indoor places such as shops, museums, etc.
You need masks in trains and public transport, plus taxis - though most have a Perspex shielding too now.
When walking about into a restaurant you have to wear a mask, or heading inside to the toilet too. But don't have to wear them sat at the table.
You don't need to wear them when outside walking around either.
Social distancing is 1m. Means cafe and restaurants tables seem much closer together than at home. But we never felt on top of one another at all.
Hotels etc feel spotlessly clean.
There are hand sanitizers everywhere. There are even automatic ones in the streets and attached to bus stops, as well as in restaurants, shops, train stations, etc
To be honest Paris felt very much business as usual in some ways