Hint - this is a buffer solution

Warning - HF is a weak acid

It's a buffer solution because there's not enough NaOH to fully neutralize the HF in the mixture.  As a result, you wind up with a mixture of HF and NaF which is a weak acid and a salt of its conjugate base.  That equals a buffer.

Very true as well.  Though in this case, if there was enough NaOH to fully react with the HF I'd feel safe in calling the overall mixture 'neutral'.  Mostly because I don't think the F- ion will tend to pull an H+ off of water and reform HF all too frequently.  If it did, then nearly all fluoride solutions would attack glass.