Help with terms

My husband are looking to move to the UK sometime within the next year.  To get an idea of costs I've started looking at places to rent online.  I'm not sure of some of the terms used.
What is a double bedroom and how is it different from just a bedroom? 
Also, what is included in a furnished and partly furnished?

Any other tips would be great!  Also, any ideas for the best areas would be great.

A double bedroom will accommodate a double bed and possibly a wardrobe. I'd get specific dimensions of the rooms, as some of the rooms are incredibly tiny.

Some of the bedrooms on offer are single bedrooms. A lot of 3 bedroom houses in my area offer 1 double bedroom and 2 single bedrooms. You sometimes also get a box room, which looks like a walk in closet more than a bedroom.

Partly furnished could mean appliances are included in the rentals. There are various degrees of what partially furnished could actually mean.

Any other tips depend on what kind of lifestyle you're looking for. Do you have children? Are you going to drive? Are you going to live in London or commute to London? Will you want to live walking distance to a train station? To town? Do you want to live in the country?

Just depends! 

In terms of furnished and partly furnished, we found that there was no standard definition for either when looking at flats.  Our place was advertised as partly furnished, however the landlord asked if there was any additional furniture we needed and then purchased those items for us.  Some places we looked at were advertised as fully furnished, but didn't even have beds!  So unfortunately, I think you'll have to wait until  a viewing or specifically ask what furniture is included.    

Any other tips depend on what kind of lifestyle you're looking for. Do you have children? Are you going to drive? Are you going to live in London or commute to London? Will you want to live walking distance to a train station? To town? Do you want to live in the country?

Just depends! 

We have no children but will be bringing our dog.  We prefer not to drive if at all possible so being close to the train is great!  We don't know where we'll live yet as we'll most likely end up where ever husband can get the best job.  Most likely we'll want to be in a city rather than the country.

Thanks for the quick replies!

The descriptions given by real-estate agents have been a point of contention for years. 

If a bedroom is described as being a double, about the only thing you can be sure of is that you can physically fit a double bed in there, even if it leaves only 2 ft. of space all around it! 

You really need to obtain the full details for a property, complete with room sizes to get a better idea of what you're actually getting.