We stayed here in Jan 2013 for our first skiing holiday and we can't emphasise enough how good the hotel was. The staff were very welcoming and always very happy to greet/help you. We don't know much French, but they were nice about it and translated the menu when necessary. We stayed half board and so had breakfast and a 3 course evening meal each day. The food is excellent - better than most restaurants we've used at home! Varied and plenty of it. The room was plenty big enough for the two of us and very clean, warm and comfortable.
Resort wise, Arc 1600 is very quiet in the evenings but we were grateful of that as we were really tired! It was so hasstle free getting off the Eurostar and being at our hotel so quickly. We had lessons in Arc 1800 with Arc Adventures - they were also excellent. There were lots more lifts and slopes there to use. We got there on the bus each day as our lessons started at 9.30am which meant we didn't have time to ski there due to when the lifts opened, but you could ski to 1800 and there was a route back to use in the evenings. The evening run was labelled as a blue...although one part of it was quite hairy, but thankfully quite brief! The first day we went down that part without our skis on!
I suspect we will be back next year and possibly even in the summer to check out the mountain biking tracks.