Transportation in Suzhou

Hoping for someone to help me out on the following:-

1. Can I buy the metro card from the MRT station? Will cash be accepted? Can metro cards be used for public bus transportation?
2. Public Bus - can I pay with coins? Roughly how much would a trip cost? Say from Guanjianjie to Suzhou Higher Education Park?
3. What's the weather like in Suzhou from 11 - 15 March?
4. What are the nearest MRT stations to Pace Hotel in Suzhou Guanjianjie? Are they walking distance?
5. Do shops in Suzhou accept cash? I have difficulties downloading the digital apps.