That being said, through various discussions & off-the-cuff mentions to quite a substantial number of people, it seems like people are interested enough to make it worth releasing.
It also has some real practical uses in some fairly common circumstances. For example, if you're physically handicapped, or you're in a city centre and need to go, but you know there is a high chance that the bathroom you visit will be really nasty. This is particularly the case around nightlife venues.
Right now, we are hosting a private beta in San Luis Obispo, as we're still in active development, but we'll be releasing to more in the next few weeks. We have a few hundred people signed up waiting for access.
This project is not our primary focus - we still have our day jobs - but we're enjoying working on it, there is quite a lot of interest & we believe that it could be a legitimately useful app which many people could use on a relatively regular basis.
I do however see something like this in addition to the HN post 3 days ago of AirPNP (https://news.ycombinator.com/item?id=7339963). I also thought that was a mock web application at first, but it seems they're serious. Maybe I'm getting too jaded that I don't recognize the needs of the marketplace.
I'm curious how many users you currently have in the beta, if you're willing to divulge the information. Best of luck with executing, and I hope you prove me wrong.