just to make it clear:
an Access Point is basically a repeater, except that it gets its signal via a network cable and not via WLAN. a repeater gets its signal via WLAN and amplifies it. an Access Point gets its signal via network cable and either sets up a new WLAN network or the same network as the original router (with the same ssid) and amplifies it. the advantage of the same ssid is that you only have one WLAN throughout the house and the devices always communicate via the stronger device. optimal for tablets/phones. a pc or NAS systems should never be connected via WLAN but with 1gbit network.
with the market leader avm you can switch between repeater and Access Point via settings.
for the house planners: you need a LAN cable from the router location (utility room? definitely near the Telekom/network operator connection) to the place where you want to amplify your WLAN (e.g. upper floor due to thick steel floor slab).
Many thanks. Very clear explanation.
Should I do the following: In the basement is the star point where all the network cables from all rooms meet. There a router, e.g. FRITZBOX 7360, is planned. On the ground floor in the hallway under the ceiling about 30cm, I plan an extra network connection + power outlet, there an Access Point is intended. For WLAN, that should be sufficient for the entire house. If not, any other network cable connection can be connected with a new Access Point. Correct?