I did the Everest Basecamp trek with Arun last year and can only recommend him. He is very professional and what is important when you climb a mountain is that you are with someone who you can trust, as you are in a wide nature, and the climb with Arun with his extensive climbing experience felt like I could trust him from the beginning.
He has a strong sense of care for the others and is great in “customer service”, so he always thinks of his climbers first and does so much extra for everyone. Then it’s important to climb with someone who is fun and easygoing, as you are walking for days, so you want to spend time with fun people. So, Arun is all this :-).