My current understanding of the labs:
Faerie Regio
- Viola's Lab
First Level of Caverns
- Big Lab: Originally Tasia, then Wishbone
- Ignem Lab: Gregorius
- Former Storeroom Lab: Formerly occupied (and expanded) by Stephen of Bonisagus, then by Timaios of Guernicus
- Former infirmary - not currently a lab, but could be set up to be.
Second Level of Caverns
- Fray's Lab
- Double-doored formerly flooded room: Set-up by Gregorius completed in Spring 1230. Occupied by Asena of Flambeau
Defunct
- Patrick the Unrepentant's outdoor ward lab (dismantled on Gregorius' orders after Patrick left).
Is that in line with other people's understanding? My key uncertainty is which way round Asena and Timaios are, although I note MTKnife's post here: Covenant suggests that Fray's lab is on the first level of the caves - I think that's wrong, though.