I thought he was superb! His name was Prem Gurung. He had about 18 years' experience, I think, and it showed. Chatting with him, he was clearly very well-trained and very knowledgeable about everything to do with Nepal, the areas we were travelling through and the related flora and fauna. He was very patient and caring, and he was nearly always available. Also great company. He lead a great team -Hemantha, our guide, who was great fun, and set a great pace, and our porters -Nabin, Kumar and Kaloo, who performed miracles of strength each day. I can't think of any way he could improve.
The schedule doesn't give you a any time to sort out kit before you leave spare stuff in Kathmandu, so be as ruthless as possible with packing before you leave, as the porters will be carrying two packs like yours each day. As the trek continued I was less and less bothered about having clean clothes, etc. Having a few clean 'non-walking' clothes to change in to in Kathmandu is nice.
There is a handful of moderately challenging days -3, maybe, and they shouldn't be beyond the ability of anyone reasonably fit. The other days were pretty easy, and I don't really keep myself fit, so don't stress too much about your ability.
Prem's First Aid Kit was well-stocked with Diamox and other pills to combat altitude sickness. They were in date and amazingly effective, so there's no need to take your own. N.B. Some online forums say that appropriate acclimitisation precludes altitude sickness, but even with those days built in I still sucumbed.
Dal Bhat is generally the best thing on the menu. And you get free top-ups! The food otherwise is endless variations on rice, pasta, noodles, veg, egg... It'll fill you up, but don't get too exicted.
Never used the recommended gaiters, but very pleased I took a buff: protects against dust, sunburn, cold... Very handy.
You will need to get used to cold, brief washes, as hot water is a rarity, despite what the teahouse ads say.although in winter, clearer skies may be more effective with solar showers. I took alcohol gel and 2 packs of wet wipes -about 50. They saw me through.