Dear Sir or Madam,

尊敬的先生或女士，

I am writing to express/air dissatisfaction/disappointment/concern regarding accommodation.

我写信是为了表达对住宿的不满。由于我发现目前的合住很不方便，

I would prefer to move into a single room next semester,as I find the present sharing arrangement inconvenient.

我想下学期搬到一个单间。需要解释的是，

I must explain that the reason for my dissatisfaction is my rommate's inconsiderate behavior.

我不满的原因是我室友不体谅的行为。

For one thing, his friends are constantly visiting him;

首先，他的朋友经常来访。

for another, he regularly holds noisy parties.

其次，他经常举办一些吵闹的聚会。

To solve this problem/surmount this difficulty/improve this situation/crack this hard nut,

为了解决这一难题，

I hope to draw the attention of the authorities concerned.

我希望引起有关部门的注意。

I am sure you will agree that the only solution for me is to move into a room of my own.

相信您也会认同唯一的解决措施就是搬到一个属于我一个人的房间。

Therefore, I would be grateful if you could find a single room for me,preferably not in the same building but as near to the college campus as possible.

因此，如果您可以为我找一个不在同楼，但离校园越近越好的单间，我将非常感谢。

Yours sincerely, Li Ming

您真诚的，李明