As a doctor, I'm not an expert in real estate but I can give some general guidelines to consider when purchasing semi-finished apartments.

In Aster New Cairo, Egypt, there are a number of semi-finished apartments for sale with sizes ranging from 217 square meters. These types of units are often popular due to their affordability and flexibility in customizing the finishing touches to your own taste and budget.

Before purchasing a semi-finished apartment, here are some things to consider:

1. Budget: Make sure to set a budget for not only the purchase price but also for the finishing costs. This will help you determine if the apartment is within your financial range.

2. Location: Consider the location of the apartment and whether it meets your needs in terms of proximity to work, schools, transportation, and other amenities.

3. Developer reputation: Research the developer's reputation and track record for quality construction and timely completion of projects.

4. Available services and facilities: Check what facilities and services are available in the development such as security, parking, gardens, and gym.

5. Legal documentation: Make sure to review all legal documentation related to the sale of the apartment, and that it's in compliance with all regulations and laws.

Ultimately, purchasing a semi-finished apartment can be a great investment opportunity, as it allows you the flexibility to customize your home while also offering a more affordable upfront cost. However, it's important to do your due diligence and ensure the property and the developer meet all your requirements and expectations.