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No amount of length is ideal, but make sure your NAP is consistent across all citations. Generally I work with a 200+ character description. I have not seen any ranking differences due to business description length.

Also, if I was you I would not out your clients website like that here or anywhere for that matter.

Sure Gurpreet! Good luck with it.

Those are called Web 2.0 links and it's a great way to build a clean tier of relevant links for hardly no money whatsoever. The best thing to remember is to keep the content fresh. Upload 2-3 /500 word articles to get started and then proceed to drip feed one article a month to them for strength.

A lot of those sites are No-Follow but from personal experience you can still see a ranking boost. Try to find some do-follow sites so all the SEO metrics flow to your site.

Cheers

Building your link portfolio comes down to two things.

1. High quality content or media that people feel like sharing which generally equals out to relevant backlinks.

2. Artificially building a link portfolio.

Don't listen to people who say that building backlinks is dead. I can show them screen shot after screen shot of keywords increasing in Google and more importantly, staying there. Here's what I recommend below.

WhiteHat Linkbuilding:

A. Start offering to Guest post for other webmasters. 
B. Create nice infographics and videos. Distribute them on sharing sites or allow readers to share them.

Content marketing is your friend here and you need to reach out to people. Personally, I see nothing wrong with setting up a PBN and drip feeding some high quality manually created backlinks.

Good luck with it

PS: Don't out your website like that publicly.

It's important to remember that Google search results typically change depending on the local area. I imagine the results you are manually checking are different from National ranking which MOZ is detecting. You can change your search settings in Google to define how you want your results to show.