Booking system design

We're a cleaning service that needs a proper booking system. After having screened the market of booking services we've chosen SimplyBook (with open API). They have all the features we need, but the design needs to be better. The buttons are too quadratic and old-looking. I would prefer a rounder and brighter design of the website, something like this: 1. [login to view URL] 2. [login to view URL] Our website: [login to view URL] SimplyBook API: [login to view URL] For recurring cleaning services we have 28 different alternatives for customers. This is because there are 7 different apartment sizes and the customers can choose between 4 different frequencies (every week, every other week, every third week and every fourth week). Presenting these in one page makes it extremely blurry and isn't a good experience for our customers, so this needs to be fixed. The best solution to this would be if customers first choose 1 of 7 apartment size alternatives and in next step they choose how often they want cleaning service. Currently the booking site looks like this: [login to view URL] Step 1: Location Step 2: Cleaning type (recurring, one time, final cleaning) Step 3: Size and frequency (28 alternatives that should be divided into 2 steps) Step 4: Booking (I'm pleased with this design, so it doesn't need any fix) Step 5: Verification (quite pleased with this design)