We visited Zel over the New Year week and thoroughly enjoyed our stay. We originally booked the apartment for our family of 4 however added an extra 2 guests at the last minute with no problems. It was a bit of a squeeze with 6 of us due to our extra guests setting up camp on and around the sofa bed but perfectly manageable.
The apartment had everything we needed for our stay including decent ski storage in the cellar area.
The apartment is a very short distance from the main gondola however, those amazing views form the balcony come at a price. The apartment is at the top of a short but very steep hill. Perfect in the morning when gravity made up for our slow pace with tired ski legs but caused us a few dramas coaxing 3 tired ski bunny children to carry their kit back up at the end of the day. We booked ski hire through Euro Sport which is close to the apartment and we received a decent discount as well as discovering a free bar whilst we waited for fitting. However, ski locker hire was only available through Intersport (at the main lift) and at such a busy time of year they were only offering hire to their customers. If we returned we would pay extra for the convenience. I believe that in quieter weeks you can hire lockers regardless though.
We arrived in resort at lunch time so had to wait out to collect our key. This wasn't an issue as we found a lovely bar to wait in however, in hindsight we should have used this time to arrange our ski hire and avoid the big queues later in the day. No fun with 3 tired children in tow.
We caught the train to resort, easy enough with the transport details provided in our information sheet by our host. The train from the airport was fast and reasonably priced. We caught the resort bus back which was also reasonably priced.
If you are visiting Zel with children then we can thoroughly recommend visiting Deims and Meins (I think it is called that) in the centre. They have a cosy basement bar with pool tables, dart boards etc and are very child friendly. We took up residence there most days. We were lucky enough to be invited to their roof terrace at midnight NYE to watch the fireworks too.
The resort pass gives you access to runs across Kaprun. We traveled to the Kitschteinhorn one day using the ski bus (free with ski pass) and took a gondola across cot the top of the slopes in Kaprun. This sky gondola was very impressive and only opened ion Nov 19.