3 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Minor
Owner reports humidity traces on dishes and on the door/sides after a wash
A certified owner on the Darty SAV community (found via the 'Siemens SN23HW60CE common problems' search) reports moisture traces on the dishes and on the appliance sides and door after a wash, and adds that below 70°C the dishes don't come out clean. This is a recurring drying-complaint pattern rather than a hard failure.
What to check. Expect mediocre drying on low-temperature/quick cycles; use hotter programs if dry dishes matter.
Professional test: rails slide well but accumulate dirt; quick-program drying weak
The French consumer-test magazine Que Choisir (found via the 'Siemens SN23HW60CE common problems' search) lists as drawbacks that the rack rails slide perfectly but accumulate grime, that the quick program dries poorly, and that the Eco program is long. This is a professional review, not an owner failure report.
What to check. Plan to wipe the rack rails periodically; don't rely on the quick program for dry loads.
Salt indicator stays lit permanently despite filling the reservoir
On the Darty SAV community index for this model (found via the 'Siemens SN23HW60CE reliability forum' search), an owner reports the salt-missing indicator stays on permanently even after filling the reservoir with recommended salt and setting the water hardness. It's an annoyance, not a failure that stops the machine.
What to check. If the salt light won't clear, suspect the salt sensor rather than the reservoir fill.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Dishwashers catalog, version 0.1.2, under the CC-BY-SA-4.0 license.