Just tried it with my neighborhood, and first match was a wrong positive, I believe:
is reported as inaccessible, but is connected via
which, admittedly, is a highway area. Is it possible that the router ignores highway areas?
In all other respects a very nice and handy tool, but with Opera (V12), it does not automatically load the area into JOSM, but I have to click on the link, which is not really an issue.