Here are some factors to consider when deciding what type of blinds to buy for your home.
How easy they are to clean
You'll need to think about how easy it will be to clean the blinds you're thinking about getting. For example, if you've been considering getting roller blinds, you should bear in mind that although you can spot-clean the fabric without taking the entire blind down, you will need to remove the whole blind from its brackets if you want to give it a thorough clean (i.e., if you want to vacuum each side of it). As such, whilst it would be a great choice for easily accessible windows, it might not be the best type of blind for a window in, for example, your high-ceilinged stairwell, as you would need to use a special stair ladder to access the very top of the blind and remove it.
In this situation, it might be better to get a blind that you could clean whilst it's hanging up so that you don't have to buy this ladder. For example, if you were to put a Venetian blind on this window, you could wipe all but the uppermost slats with a damp or dry cloth to get rid of any grime and dust without removing the entire thing.
How much privacy they provide
You must also consider how much privacy the blinds you like will provide and whether this level of privacy will suffice on the windows to which you're planning to attach them. For example, a sheer roller blind probably isn't a good choice for your bathroom, as whilst it will obscure most of the room's interior during the day, it won't do the same after dark when the bathroom light is on. In this room, a blackout roller blind would be a more suitable choice. In contrast, if you have a window in your kitchen that overlooks an enclosed garden that your neighbours can't access, then a sheer blind would be fine, as you won't require as much privacy in this space.
Venetian blinds are excellent for rooms in which the level of privacy you require differs from day to day. This is because you can change the slats' positions. You can obtain total privacy or none at all, or you can leave them in a slanted position if you need a little privacy but don't want to block out all the light.