generally, noise removers blur as part of the process. so, the first thing i did was to sharpen.
high pass sharpen about 5 to 7 radius.
duplicate that and unsharp mask 5/100/5
duplicate, salt and pepper filter at 5/5
new blank layer over that and smudge and airbrush a bit. both of these at low strengths.
gausian blur that layer VERY lightly. i used 1
another blank layer and a tiny bit more smudge.
there's more that could be done, but this was rather quick. if you zoom in you'll see how quick

but at a zoom of 100% it looks mostly ok.