I play a completely vanilla game (and have all the packs) and have been playing For Rent almost daily since release day and have enjoyed it. Nothing game breaking or file corrupting has happened (touch wood!). I'm not a builder, though, so I don't know anything about the lot types error (although I think the recent patch was supposed to fix that) or creating my own residential rentals (other than editing an existing one).
I downloaded two rentals from the gallery (used one in Tomarang and one in Strangerville) and also played with the rentals in Tomarang as tenants. I did edit one of the rentals I downloaded to include a 3rd unit to satisfy one of the 5-star Property Owner aspiration goals and that all went fine. I've played a Sim that was a landlord living on the property and one that lived in another world and both went fine, eventually completing their 5-star aspirations.
The only glitches I've encountered so far that I recall are:
1.) where you can't fill a vacancy if you're the landlord and live on the property and marry (or move in with) one of your tenants. But I used Manage Worlds to solve that (I just picked a homeless townie to move into the unit, everything functioned fine after that.);
2.) the residential rental community mailbox did not let my Sim Ship on Plopsy, the action just canceled itself. Once the Sim moved to a regular house with the standard mailbox Plopsy worked fine again;
3.) Rent getting stuck at a very low value like 4 after a tenant leaves and not being able to change it when you try to Fill Vacancy. I solved this by going into build mode on the unit before trying to rent it again and making some minor changes to the items in the rental, then the rental went back to something more reasonable based on its star rating. I don't think it should work like that, though, so I consider that a glitch.
4.) Not being able to satisfy the "break a rule successfully" aspiration goal for the Discerning Dweller even though my Sim broke two rental rules and was fined 250 for one. Read online that it supposedly only clears if your Sim lives alone and my Sim was married with kids. I just used a cheat to bypass it.
Nothing has been game breaking, but the marrying/moving in with another Sim (into your home, not theirs) does seem to be glitching and I'm not sure it's just rentals. I've had to move my Sim in the other direction then use Manage Worlds to put them back in my Sims' original home. I can't remember though if it only happened with rentals, or if was houses, too.
Maybe worth noting, I didn't start a new file for For Rent, I've been using one that was created maybe a couple weeks before the game released. I just created new Sims to use the new features, one for each new aspiration (and an extra landlord in Strangerville).
Overall, Tomarang is a beautiful world. There isn't much to do in the world activity-wise, I'll be honest about that, but it's gorgeous for just walking. jogging, or biking around. There are a lot of open areas you can access without loading screens. The beach is nice, the cave is an interesting landmark to visit, the park is pretty, I love the bridge, the night market is good--could use more stalls and visitors to feel "bustling" (the festivals in San MyShuno have more visitors), but my Sims did fine making new friends there and trying new foods. I like the world, it's one of my favorites.
