So today on my way to the supermarket (open on Christmas day!) i drove an extra few km to check coverage
In my car:
* Doezastraat: YES
* Witte Singel, in front of the Astronomy building (Sterrenwacht): YES
* Beestenmarkt: YES
* Steenstraat / Station: YES
* Langegracht: Partial, problems around intersection Pelicaanstraat.
* Hooigracht: NO
* Herenstraat: NO
* Lammenschansweg: NO
There are better ways to map coverage, but at least this gives an idea of coverage in Leiden at the moment.
My conclusion is that we have outside coverage for most of the commercial shopping area with a lot of potential blindspots.
It would help if some of the gateways are high up, as in my attic (near Schelpenkade) i have coverage on one side of the building but not on the other, and even outside i have no coverage on ground level.