One of the key advantages of Wireless Mesh Networks (WMNs) is their importance for providing cost efficient broad band connectivity. In WMNs, there are issues for achieving the network connectivity and user coverage, which are related with the node placement problem. In this work, we consider the router node placement problem in WMNs. We want to find the optimal distribution of router nodes in order to provide the best network connectivity (the maximal number of connected routers) and coverage (maximal number of covered clients). We apply our proposed WMN-SA simulation system in a realistic scenario of the distribution of mesh clients considering It oshima City, Fukuoka Prefecture, Japan. From simulation results, we found many insights that can be very important for real deployment of WMNs.