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Friends offer well meaning advice. If your friend has performed a soil and/or leaf testing, I would withhold action until testing is done and results with recommendations are reported back to you. The following article has a lot of information you should find helpful: http://homeguides.sfgate.com/brown-leaves-cape-honeysuckle-36430.html

Aphids commonly affect these plants and this is most likely the pest you are seeing. Neem oil is an effective treatment for these pests and quite safe to use, so there's no threat to other plants, beneficial bugs, pets, or even humans. Here is more info: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

It could be either a fungus or pests. I would treat the plants with neem oil. It treats both fungus and pests. Here is more information on it: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

Here's an article on growing honeysuckle: https://www.gardeningknowhow.com/ornamental/vines/honeysuckle/honeysuckle-vine-care.htm
The bugs sound like they might be thrips. Whatever they are, you should be able to control them by using one of these methods: https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm

The perception of honeysuckle scent is rather a personal thing. Many people report that the scent of honeysuckle is most noticeable at night, without regard to variety of plant. However, because night flying pollinators are most attracted by white and yellow blooms, honeysuckle with those color flowers may be more likely to have stronger night time scent. Here's an article that refers to common varieties: https://www.gardeningknowhow.com/ornamental/vines/honeysuckle/types-of-honeysuckle-plants.htm