I've stayed there a few times and would stay tehre again, its clean and nice and has a restaurant on the first floor, open for breakfast, lunch and dinner. I've also stayed at the Hiyatt, right across the street which caters more to backpackers (read budget travelers). Its also clean with private baths.
I stayed there for a few days last October and loved it. If you can "splurge", go for the 4th floor room... can't remember the name of it right off the top of my head, but it takes up the entire 4th floor. An amazing space - after long days exploring, it is certainly a welcome place to come back to.
#21022 - 04/22/0607:18 AMRe: Martha's Guest House, San Ignacio