In some places there are government basemaps available as well. These can be extremely accurate, up to centimeter precision. Of course they can be outdated or have mistakes too, and not all are as precise. So it’s hard to answer the question without knowing the location. Always vest to consult with local mappers about things like this.
Yeah, the centre. But many places like this are half dead at the core, with car centered suburbs around it and shops in big malls along the roads. The difference with Spain is stark, where the old centres are usually still the actual heart of the village.