We visited Villa Echo last year. In answer to your questions:

1) We have stayed there to do an independent inspection - see above.
2) Canggu is a go place to be based. It is quiet but close enough to Seminyak etc to be able to see all these places.
3) This villa is run by one of the best management companies in Bali so the staff will be excellent.
4) I personally find this villa a little confined so prefer others.
5) This is a good place to be based.