When I enable VPN under "quick set", I see it ads a masquerade in src-nat chain, using IP 192.168.89.0/24
And also under "PPP > profiles" the "vpn" profile has associated "local address" 192.168.89.1

- my router was set to have it's main local address 192.168.1.1 and I am not sure if the VPN should use the 192.168.89.1 or that is like a glitch and should actually be edited to 192.168.1.1 ?
- under PPP profiles, that local address is like a virtual server/interface that responds to VPN on that port, or is it an address that is asigned to the VPN client once it connects to the Mikrotik VPN ?

I don't use quickset...

But from what you posted... looks like it is setting up the VPN connection to get a 192.168.89.0/24 address.

If this was allowed in the firewall... you would be able to reach your local network unless SPECIFICALLY blocked.

Quickset sets up the VPN using a separate subnet (192.168.89.0/24) than the default (192.168.88.0/24). You change it to the IP and subnet of the router if you wish.

It is not advisable to use Quickset past the initial setup, especially if changes where made outside of Quickset. It relies on a basic set of scripts to make changes and if all conditions are not true you will see mixed results.