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@Smallfurry
Quark.
Its difficult to pick one based on inseam as the frame has compact geometry (slopping top tube). So the seat tube length is misleading.
On a traditional geometry frame, I'd guess at a 62cm (seat tube C-T).
(91 x 0.883) = saddle top to BB center length needed
minus saddle height (5cm), and minus 13cm of seat tube.
Gives a seat tube length (c-t) of 62.
A 62 would usually have around a 60cm top tube (C-C). Bang in the middle of the two sizes.
But given that the frame you are looking at has a steep seat tube angle, you are likely to have to use a bit more saddle set-back, to put you in the correct position over the BB. This increases the distance from saddle to bars. So I'd round down to the 59 top tube of the XL.
This is merly an educated guess though. The absolute best thing would be to work out your reach (saddle to bars), by trying a few bikes out for comfort. Then use this to find your idea top tube length (using say a 110/120mm stem).
If you can test ride to bike in question. Make every effort to do that IMHO.
Hope that helps.