Platform as a service (PAAS) featuring computer software platforms for management of web-based software for others that: 1) allows users of computers, mobile phones and related mobile devices to communicate with each other and to send and receive messages regarding event locations owned by others for rent; 2) provides the use of a web-based software application for providing an online marketplace for buyers and sellers of goods and/or services on a global computer network; 3) provides use of a web-based software application for providing a two-way system for users of an online marketplace to evaluate and provide feedback regarding other users they have interacted with via the online marketplace; 4) allows users to manage, organize and share with others event bookings, activity dates, photographs, opinions and preferences; 5) allows users to list real property and services for rent and receive suggestions to improve their listing advertisements; 6) allows users to list real property and services for rent; 7) facilitates the sale of goods and services via computer networks and provides evaluative feedback and ratings of sellers' goods and services, the value and prices of sellers' goods and services, buyers' and sellers' performance, delivery, and overall trading experience in connection therewith; 8) allows users to list and announce regarding real estate rentals and advertise for the same; and 9) allows users to provide reviews and feedback about listers and renters of real estate and to make payments for rental of real property locations