Booking Engine for Apartment Site

I require a booking engine and back-office to control booking engine for an apartment rental website. Credit card transactions aren't part of this specification, this is for a later phase of the project. Site is on Linux. No graphic design work required. ## Deliverables Is there an open source solution, or off the shelf solution out there that you can recommend that you can modify, or install for me? Require fields for: Choose City Choose Arrival Date Choose Departure Date Number of Guests Number of Children Number of Babies Selection of Rooms or Apartments Need backend to be able to update status of apartments from booked to available, depending on dates, and have this update the booking system. Need to be able to send an email from the site to the booker to confirm booking. Need to be able to take details of booker, name, address, country etc. Is there an open source solution, or off the shelf solution out there that you can recommend that you can modify, or install for me?