Can you please check these few sentences? Thank you.

1) I spent the whole afternoon tidying up my second-holiday home.
Are you going to get upstairs by lift/ to take the lift up to the second floor?
2) Are you going to walk upstairs?
We spent an awful lot of money to hire a sun-bed and an umbrella for a fortnight.
3) How do you call an album to collect Pokemon cards?

1) The sentence sounds fine, but I have no idea what a "second-holiday home" is.

The second sentence is OK too, if you're in England. In the US, lifts are called elevators.

2) Are you going to walk upstairs? - OK

We spent an awful lot of money to hire a sun-bed and an umbrella for a fortnight.
Sentence is OK if you're in England. In the US, the verb would be "rent" and a fortnight is "two weeks."

3) How do you call an album to collect Pokemon cards?
I'd just call it a collection. What you display them in could be called an album or a folder.

Sure! I can check the sentences for you and provide feedback. Here are the sentences:

1) I spent the whole afternoon tidying up my second-holiday home. Are you going to get upstairs by lift/ to take the lift up to the second floor?

This sentence is grammatically correct, but there are a few ways to rephrase it to make it flow better. For example:
"I spent the entire afternoon tidying up my vacation home. Are you planning to take the elevator to the second floor?"

2) Are you going to walk upstairs?

This sentence is grammatically correct and doesn't require any changes.

3) We spent an awful lot of money to hire a sun-bed and an umbrella for a fortnight.

This sentence is also grammatically correct, but "hire" may not be the most commonly used word. Instead, you could use "rent":
"We spent a significant amount of money to rent a sunbed and an umbrella for two weeks."

Now, regarding your question about Pokemon cards:

3) How do you call an album to collect Pokemon cards?

To answer this question, the common term for an album used to collect and store Pokemon cards is a "Pokemon card binder" or simply a "card binder." It's specifically designed to hold and display Pokemon cards in an organized manner.