what happens when you checked and noticed that your investment is losing money?
what would you do?
how much % of loses can you "tahan" to see invested money being 'eaten' away?
what would you do?
sell all before it get worse and come back to fight again some other day?

Definitely suitable the only difference is your risk assessment profile on which portfolio is suitable for you 

Stashaway is designed for folks like you, but the advise from MUM is extremely relevant.

You must know what you are buying which is a split basket of ETFs comprising of index funds, and usually some Gold.

Now once you know you are indexing, in a way you need to accept that it goes up and down according to the market of the fund you are buying. And if you know that then you also know that once in a while something bad happens and it can even drop 10-20% in a year, or even slightly more. THat means that in the absence of something catastrophic anything else can cause drops of 1-9% without too much "reason".

You also need to know that generally markets tend to go up over time.