If you have several properties then it is a good idea to have everything in one dashboard I only have one property on airbnb these days, all my others are LTR I used to use iGMS I found it good and easy to use good backup and response time,
Having your own DBS is a good idea people say, I got myself one a few weeks ago, I have all my previous guest details in a whats app group so I can send it to them, plus I have been promoting it on FB groups lots of clicks on it,
It's easy enough to build a web site but you need payment facilities which is not easy to get, I can show you what I did but I will have to send to your in box,