The bus from Singapore to Kuala lumpur takes about 6 hours via any bus courier in my case when I went from changi airport, in Singapore I paid 15 SG dollars for 6 hour bus trip going to kuala lumpur, The name of the bus company is pacific express and from TBS which called are the bus hub in Kuala Lumpur where you can buy tickets from every destination through out Malaysia and Singapore or vice versa. The ticket depends on your destination. In my case I am going to Ipoh which I choose Amanjaya where my host came from, which I have to get an Uber taxi for 20 minutes ride and it cost me around 25 MY ringgit.
The name of the guest house that I will be staying is Golden roof hotel and the cafe which are located near with that is called Volcano Grill which are close Monday. I dont know why mostly establishments are close in Monday in Ipoh.