I found out after a week that they did not put "gel" on my nails but simple nail polish. They also told me they could do a marble nail art and did a really mediocre job, I would have preferred if they told me they simply couldn’t do it upfront.
The general experience was quite good, I wanted to get infills with my nails reshaped and with a different polish (shellac) with glitter on it. The glitter wasn’t exactly what I wanted (I think it is due to a lack of material) but the general execution was flawless, they do a really good work and are very nice and caring. I will definitely come back!