Interestingly enough, WLP004 just scored very highly as a mead yeast in a recent issue of Zymurgy.
I have used ale yeasts many times successfully in ciders. In particular I like the results from US-05, but I'd be willing to try WLP004 as well. The key perhaps to avoiding a yeasty flavor is to add gelatin at the end of fermentation to knock the yeast out of suspension, otherwise it likes to hang out in the cider for a long time and then you taste it when drinking.
With any yeast, it also helps to ferment cool, around 55-60 F, for best results. This is true even for ale yeasts. They'll ferment cold, just give them a lot of time. Low and slow is the way to go. Give it a full month or even 6 weeks or more if it needs it. So patience is also key.