Hi Sir/Mam,
This is Sunil Joshi this side and I have just get your requirements .I think that I can be suitable freelancer for you ,it is just because I have done such projects earlier also.
According to your requirements,ordinary web based software prices are expensive for small vacation rental properties and you need to create a solution for a few small business of my town.
So according to that, in one side you have a Wordpress plugin and other side you have a channel manager and you have to connect them.
Technology Stack:-
PHP, ASP.net, C#, YII, Cakephp, Codeigniter
CMS - Wordpress, Magento, Open Cart, PrestaShop, Drupal
Thanks
Best Regards
HawksCode