I wouldn't worry about it, unless it seemed like something else weird was going on - like you though it was just a place to manufacture drugs or something.

Maybe from manufacturing meth?

After all, there is only one appliance from that manufacturer that will have that serial number, and you are documenting that it is yours.

I can't really see the condition of the floors or walls because she had them repainted and plastered with decals and posters.

^It seems a lot of people here are jumping the gun here...nowhere did OP state that junkies are coming and going from the house, or that drugs are being manufactured in the unit...Is it great that someone is using drugs in the unit?

Most tenants don't know that, and what they'll do, though, is start manufacturing habitability problems so they can break a lease.  

I have already gotten them a welcome gift bag prior to them moving in- since they just had a baby, I got them a baby outfit, a large wall decal for the nursery, and baby cleaning supply..

Designers and manufacturers always have to change the latest fad in order to prompt consumer demand.

We've never had a machine fail inside the 5-year window, unless it failed in the first 6-months due to a manufacturing defect ... in which case it is covered under warranty (which is 24 months on the units we purchased).In short, the extra rent and the ease of filling units (before the become vacant) more than offsets any increase in water consumption.

I’ve lived in the area my entire life (in a small town about 30 minutes out), worked here since I’ve been out of college, and started investing here in 2012.Industry/manufacturing is the heart of the city’s economy although it is less dominate than it was in the city’s prime 10-20 years ago.