Difficult to help too much - most places are clean, safe and have good train connections.
How much do you want to pay for rent and how close do you want to be to the city or to the green open spaces?
Most expats that I know seem to live in either Muri bei Bern or Thun. In general, I'd go south from the city center, along the train lines. (The expats that I know are mostly American, btw).
Muri is closest and is connected by tram. You might also check out Worb, also on the G tram.
Thun is about half an hour by train from Bern, it's on the lake and quite pretty, but if you don't live close to the train station, you'll need to connect via bus.
There's also Rubigen and Muensingen on one side of the Aare, and along the other side, there's Kehrsatz and Belp.
We live in Belp, about 11km from the city center. We're on the outskits, in a fairly modern apartment complex, but we have a car since we're at the top of a big hill. Still, there is a bus every half hour till 7pm on weekdays that takes you to the train station (1km or so), and a half hourly train that takes about 15-20 minutes. There's a lot of new construction in the area. I like living here - nice mix of rural and modern, and the small town of Belp has an excellent butcher, grocery stores, good doctors, and access to the highway. On the downside, you can be a little far from the train station, but we choose that. There are apartments in town, too.
You should get a map and look south of the city center, on either side of the Aare between Muri and Thun, those are, I think your best bets. We've been very happy here... there are a lot of kids, the apartments are modern (10 years) and we have good views. We do pay for this, of course... We feel very safe here, and our neighbors, all Swiss, are very nice.
If you want to be a little closer within the city, but not quite in the center, check out the elfenau (I think it's post code 3006). I'm of course biased because I'm south of the city, but there are other areas such as Koniz (sort of west), Brunnen (near the westside mall), Ittigen, Bolligen (more north).
What are your space and price and distance requirements? And, have you started to look?
PM me if you want more details....
good luck.
Elaine
Haven't met many expats here though!
Depends on what you're after.
So maybe the groaners can now offer their better advice?
Me, bitter? Of course not!
Bern is a safe a place as anywhere in Switzerland, as an expat I assume you're not going to start sleeping under the bridge with the junkies so that danger has been alleviated.
I live in the city center and I love it.
-Alison
Bern is so small, quiet, green...
I am also in the process of moving to Bern right now and would be grateful for any advice about good/bad areas or specific places to avoid. Please send me a pm if you like.
You will be hardpressed finding something matching your description for 1800 CHF unless you move further out of the city centre. Try places like Munsingen? Personally, I loved Thun. Such a charming and beautiful town.
Somewhere else maybe worth looking is Bremgarten, just north of the city. Its a very nice area but I think you will be paying something like CHF2500-2700 for the kind of thing you want.
Why do you need something temporary? Are you looking the rent then buy?
You can specify your search criteria if you select "extended search". The search parameters are in english (if you select the english), although most adverts are in German.
Apartments are expensive here, especially if you want space and rooms. My guess is that you're looking for a 5 room flat (3 bedrooms is usually 4.5 -5). CHF 1800 might not do it for you...on the other hand, I haven't looked in ages so I might be wrong.
ETA - I'm thinking 2200-2500. We pay a bit more than that for 6 rooms, modern, large terrace and lots of space.
That south-east area is quite nice, maybe a bit expansive though, as there are lots of embassies in the area and Elfenau park. I'm moving to Rufenacht close to Worb. Anyway, I like the south and east side of the city, I think they are the best areas.