Hello mate,
Great to hear you are planning to restart your old business in the property booking sector. I was also in the sector until a few months ago until we decided to shift gears into the real estate business. We were doing property managing for property owners and we designed an app both web and mobile for that. We are now selling it since it has no use for us. Give it a look in here Template For Sale: Hostmaker style app property managers
If instead of competing with airbnb, booking, tripadvisor and others you decide to become their partner pm me and lets talk.