For a better network

I live in a small stone house from early last century. My box is located at the basement and the wifi network it creates suited me until now. 2 laptops, a pc with remote fixed wireless antennas, a shared printer (using the same network), 4 smartphones and televisions request it, phew .... Another laptop uses this network but with difficulties. Indeed, it is the floor of the house and it's getting too far away (frequent transmission interruptions, network status bar sometimes two ... My son is the victim, and he was getting fed up. I could not see myself draw subsurface cables upstairs and degrade all the way ... So I searched and found this little box. According to various forums, test sites and the notation amazon, it matches my expectations ... I first used my smartphone and an app to find the ideal location (excellent reception of the wifi signal box, as far as possible of it) and I ' I plugged this repeater there. I had to restart the commissioning protocol 2 times before you understand what to do (it's not very clear for a noob like me ...) and now the laptop My son receives the signal repeater with 5 bars, impeccable! Since my power grid suffered power cuts 2 General. Well, no problem, everything is restarted without flinching, my son is delighted. I even plan to redirect some of the devices using the original signal so the new signal is good ... One star less for explanations. A short video tutorial in French would not be too much, in my opinion.