How is are the APs connected to the router? And which model AP?
I got the UniFi Dual Band AC Long Range AP to cover a big part of the house and the flatlet, then an UniFi Dual Band AC Lite AP to cover the rest (as the longrange didn't go through some of the walls at its edge).
The APs are attached to the ceiling and run network cables in the roof, then through the ceiling in the one corner of the room where the router sits, down wall behind corner trunking, into Power over Ethernet devices that came with the APs, then into the routers LAN ports (#3 and #4 on the router).
The mikrotik by default allows the APs to request dhcp addresses, and the Unifis come with webserver-based software to configure them (SSID and password etc).
This is more or less what the software looks like...
-G-