I decided to write a review in English for those who don't read French and may find this useful, as…read moreall the extant reviews are in French. Négatif Plus is possibly the best overall film processing lab in Paris currently, and able to handle an impressive array of traditional film as well as digital formats and printing needs. They're well-organized, but despite that it can get very busy and even veer towards downright bedlam at times. If you have digital printing to have done, send it in via their website and you'll be informed of when your prints will be ready and then you just need to come by for them: to drop off film, alas, you'll have to pop in for an actual visit, so pray you don't come at a busy time or you'll be waiting a bit.
Also, they have the capacity to deal with many historical/antique negative formats insofar as contemporary printing and, I believe, retouching/corrective work.
They know what they're doing though, make no mistake. They're quite nearly flawless.