It also has great, simple maps and lists of albergues. Do not be put off by the fact that it is in Spanish: you can still get a lot out of it even if you speak no Spanish. You only need to know that Buscar Localidad means Search for Location.
There are also reviews of accommodations, each with a 'recommended? - yes or no'. These yes/no answers are summarised into a red/green bar chart.
It does not have an App to download, but the website does render really well on a mobile phone, and the pages can be saved offline in Chrome.
I really like Gronze, I try other websites and apps, but keep coming back to it.