1. I tried Hotelrunner. It was very painful to setup. For some reason booking.com was keep waiting for the hotelrunner connection, and it was only solvable via hotelrunner online support. Their online support was very friendly. I made some mistake in the mapping process, and they helped me to correct it, but were not able to solve to wrongly mapped booking so I gave up.
2. I had a look at booking automation, but the price was too high for the 8 rooms that we have.
3. Syncbnb is a nightmare. Instead of using the official API of each site, they require you to provide them all credentials of each site. They have another function missing on their platform which is price sync. I cannot imagine having need to manually sync the pricing across 3 platforms. The customer service said price sync is still in beta mode.
4. Freetobook's interface is still from the 90's. It was a pain in the eye so I gave up.
5. Frontdesk Anywhere didn't allow me to have immediate trial account. You just have to wait for the email. I gave up
6. Smoobu has fantastic user interface and it just works. Only problem is their date/ currency unit system is based on German system, and even after changing the preference, it still doesn't change. However this is the only trial account we were satisfied with, and we decided to pay for this platform.
Following is a link where you can get 30 days trial on Smoobu, and if you chose to pay, you get 30 Euros off (and we as well)
https://login.smoobu.com/de/login/signup?hash=R18063363