I would recommend not going at night time or when it's gloomy outside... Made that mistake and felt uncomfortable. I would not go exploring into any houses or apartment buildings... there is a really cool church that Ive been to and a old abandoned train station.

Nothing wrong with gloomy weather (I actually like it that way, the contrast from the sun isn't as strong when shooting near windows). Stick to downtown and you can do stuff at night, the church takes on a totally different feel.

Some do the houses, I don't as the risk outweighs the interest. The apartment buildings were fun back in the day but many of them are fucking trashed or torn down, now.