Hi,
The development seems good an investment because of its location and payment structure in Ajman. The Emirate of Ajman is fairly minute in size (around 150 sq km) and has a population of almost 100,000. Ajman is basically a place where lower middle class people working in Dubai live! Ajman to Dubai drive is around 20 kms but it takes 60-90 minutes during office hours and shopping hours (that pretty much means almost every hour of the day you are awake!).

Right now, one bedroom apartments usually go for 18-25K AED per year or maximum 30K depending on the area and how new is the building.

Ajman is known for fishing, some old archeological sites, few shopping centers, beaches and its free zone.
Many thanks