Hello! Nice to meet a new person on here :D
I'd recommend that ISS detector app, it shows other objects and makes it quite easy to pinpoint where it will be as it shows current and predicted elevation. That said, my experience has been that for a few weeks you'll get a huge burst of activity almost nightly and then things will go quiet for a while; a lot of the time it's been too cloudy to see anything but there's always the odd day where it's perfectly clear.
Try seeing it when it's low in the sky (about 30 degrees inclination) and when it's directly overhead (I've seen it very close to 90!) it's absolutely awe inspiring how quickly it goes by, and especially how bright it can be. I've been very lucky to have had the chance to catch it both as it appears on the horizon and as it disappears; it plays an optical illusion where it slowly fades in to sight, moves closer very slowly, wooshes overheard shining like a flare, then slowly moves away into almost a static point in the sky before fading away. Very cool to watch!