City interior inspection for tax assessment - should I let him in?

[Uwe K.]

Actually not sure if I am in the best category here:

Got a letter from the city yesterday about one of my duplexes. They offer me the opportunity (I feel so special) to make an appointment for interior inspection for assessment purposes, claiming, of course, if gives a fairer assessment than if he would judge only by the outside.

My properties got re-assessed multiple times over the years, and so far I only got the re-assessment notice. Bam, take it or leave it. Never this "one-time opportunity to call within 10 days".

Wondering now if I should let him on or ignore him. Would it help or hurt to keep the assessment and thus the property taxes down?