We spend here 4 nights in Feb 19. We are a family with 3 kids. We had a great time.
Main bonus of the apartment is its location, just by blue ski run and lift Biancaneve. In fact you can see Biancaneve from the window. Once a week it is open for night skiing. 5 min on ski or walking with ski to Panciana gondola.
The apartment was clean. Decor 70s/80s. Not too big but big enough for us. There was an electric kettle, 2 ring cooker (quite slow but working), dishwasher, lots of pots, cutlery. Also oven but we haven't used it. For our family needs I would add more spoons, knifes and forks so that we don't have to run the dishwasher half empty; and a microwave would also be helpful. The apartment is warm, hot water in the bathroom and kitchen.
There is a ski locker (not heated) and a car space (quite small). We have not used the swimming pool (it is paid separately), nor the restaurant, only snooker tables. There is a proper shop in 3 min walk, pharmacy, lots of ski rentals.
We have fallen in love with Marilleva and its sunshine, and will be back.