My two kids, wife and I were lucky enough to spend three weeks in the chalet in July/August. The chalet is in a perfect spot with views to the lake from one side, and fantastic views to the mountains above Val Claret to the other. The main part of the balcony faces South and many an afternoon were spent basking in the sunshine taking a well-earned rest from the days' activities.
A 5 minute stroll to the shops and restaurants of Val Claret and 10-15 minutes walk round the lake to the main part of Tignes.
The most amazing thing about our stay was that we only used the van 3 times over the 3 weeks, and only when heading round to Val d'Isère. Everything is so close that it wasn't necessary to use it getting around Tignes.
All 4 of us had mountain bikes and made use of the fantastic trails (all with lifts to take you to the summit) and even our youngest (6 y/o) was whizzing down the green runs in Tignes ("Smoothie" and "Easyride") and Val d'Isère ("Popeye"). The 9 y/o was smashing the blue runs (which were quite tricky compared to blues in other spots we've ridden). The grown-ups' favourite runs were the all-mountain trails, especially the ones down to Val d'Isère. But be warned, they are quite remote (and technical/steep)! The red then black run under the main Tignes bubble was always a great way to finish a day.
The "My Tignes" pass which comes free with the accommodation provides free access to all of the lifts in the summer along with 2 other activities each day so there was always lots to do with the kids on the lake, trampolines and in the pool when not on the mountains.
The only potential downside was that we thought we might be able to get straight to the lake across the field but you need to go back round the road to the main path. This is actually for the best as it keeps the area around the chalet much quieter with nobody passing through.
The chalet itself was a perfect fit and we quickly felt completely at home. The photos don't really do it justice but I can imagine it is a tricky place to photo! It had everything we needed.
The owners were fantastic with their communication and even fitted a pulley to allow us to winch our bikes onto and off of the balcony which worked really well.