Would you mind sharing why it should be avoided, according to what you've heard? I admit that surprises me, so I'm curious to know the reason behind it.
Same for me, I'd be curious to hear that - never heard of anything myself ! Thanks !
Otherwise, I completely agree with
iff's comment and I think 15th arrondissement is a nice area to live in - I lived there for some time near "Convention" subway; also because it is less 'touristy' housing is a bit less expensive than in many other areas.
J-